Starlink’s dish tracks satellites crossing the sky at 17,000 miles per hour. Anything that interrupts that line of sight — a single branch, a chimney three houses over, a hill you can’t even see from your window — creates a dropout. This guide explains exactly what counts as an obstruction, what your app numbers mean, and what actually fixes it.
The questions people have after the first week of use — when drop-outs start and nothing in the quick-start guide explains why. Answered plainly.
Any solid object that blocks the line of sight between your dish and a moving satellite causes an obstruction. Unlike old-style satellite internet — which aimed at one fixed point in the sky — Starlink’s satellites orbit at about 550 kilometers altitude and move continuously across your sky. Your dish must track them as they go. When something physical interrupts that path at the exact moment a satellite is passing through that slice of sky, the signal cuts out. A branch you barely notice can cause dozens of one-second dropouts per hour if it sits in a heavily trafficked part of the satellite corridor above your house. The frustrating part is that the same branch may cause zero problems at other times of day, making the interruptions seem completely random when they aren’t.
It depends on what you’re doing online. Below 5% is the widely accepted target — at that level, most users experience only rare, brief drops. Between 5% and 10%, you’ll notice intermittent interruptions during video calls and gaming while streaming and browsing hold up reasonably well. Above 10%, the drops become frequent enough to frustrate most uses. At 8%, casual internet use, streaming, and email will generally work, but video calls and online gaming will have occasional disruptions that worsen when satellite density in your area is lower. The 8% number is not a death sentence — it means you’re in a borderline zone where reducing obstruction by even a few percentage points (sometimes a single branch trim) makes a measurable difference.
Trees are the most nuanced obstruction type because they attenuate the signal rather than completely blocking it — foliage absorbs and scatters Ku-band radio waves rather than acting as a hard wall. Bare branches in winter cause fewer drops than the same tree in summer with full leaf cover. A tree that reads as 3–4% obstruction in the app in winter may climb to 8–12% in summer as leaves fill in. Research from the University of Idaho’s Experimental Forest found that whole tree trunks and thick branches disrupt the signal more than dense foliage canopy alone — which is counterintuitive but accurate. For users in wooded areas, running the obstruction check in summer (when foliage is fullest) gives the most realistic picture of year-round performance.
Beam switching is the system Starlink updated in mid-2025 that allows the dish to actively route around known obstructions rather than just waiting for them to clear. For a fixed installation, the dish builds a real-time obstruction map over the first several days of operation. Once that map is established, the dish proactively connects to a satellite that is not heading toward a known obstruction, switching routes before the blocked path causes a dropout — making the switch invisible to you. For mobile terminals, reactive switching activates in less than 100 milliseconds when any satellite signal degrades. The catch: beam switching helps with minor obstructions but cannot overcome a situation where a large portion of the sky is blocked. If a tree covers 20% of your sky view, there may simply be no clear satellite path available at that moment.
Yes — and more dramatically than most people expect. A single 30-minute arborist visit to remove a handful of upper branches that cross your dish’s sight line can reduce obstruction from 15–20% down to under 5%. That’s the difference between a frustrating, drop-prone connection and one that works reliably for video calls. The math: arborist work to remove a few problem branches typically runs $150–$400. A 20-to-30-foot pole extension to raise the dish above the tree line costs $200–$500. The branch trim is usually the better first investment — it’s cheaper, faster, and doesn’t require a new mount. The downside is that trees grow back. Plan to re-evaluate every two to three years as branches regrow into the signal path.
Nothing is wrong — this is the geostationary exclusion zone, also called the Clarke Belt. Starlink’s satellites orbit at low altitude and move constantly, but older geostationary satellites (the ones used by previous-generation satellite TV and internet services) sit fixed above the equator at about 35,000 kilometers. To avoid radio frequency interference with those satellites, Starlink dishes are prohibited from transmitting in the direction of the equator at the relevant elevation angles. The white band on your map is Starlink’s self-imposed no-transmit zone — not a physical obstruction in your sky. It has no effect on your service. For most U.S. users, the band falls in a direction and elevation where relatively few satellites pass anyway, so the practical impact is minimal.
Ground-level checks are one of the most common and costly Starlink installation mistakes. When you hold your phone at standing height (about 5–6 feet), you’re checking the sky view from a completely different perspective than the dish will have on your roof, which might be 15–25 feet higher. At the lower height, your house blocks part of the sky that a roof-mounted dish would see clearly — but trees and other obstructions that the roof-mounted dish will actually encounter are below your phone’s horizon. The Starlink support documentation specifically says to hold the phone as close as possible to the intended mount height and position. For a roof peak install, this means getting on the roof or holding the phone on a pole extended to roof height. This is non-negotiable for an accurate result.
Yes. The hardest cases are terrain obstructions — hills, ridges, and mountain slopes that block a significant portion of the sky from any position on your property. No mounting height, no pole extension, and no tree trimming fixes a ridge that blocks 30 degrees of the northern sky. In the U.S., the satellite density is highest in the northern sky arc for most locations, so a north-facing ridge blocks the most satellite traffic. Similarly, an urban canyon — a property completely surrounded by tall buildings on all sides — leaves no viable mounting position. The Starlink app’s obstruction check, run from multiple spots on your property, will tell you definitively whether any location on the land gives adequate clearance. If every spot scores poor, Starlink may not be the right service for that address, and that’s worth knowing before spending $599 on hardware.
What’s blocking your signal, how it shows up in the app, and how fixable each type is. Hard obstructions block completely — soft ones attenuate and scatter, which can sometimes be worse for user experience because the dish gets a degraded signal and wastes time on failed handoffs.
| Obstruction Type | App Behavior | Fixability | Best Fix | Seasonal? |
|---|---|---|---|---|
| Trees with full leaf cover | Scattered red dots · soft obstruction | Yes — trim or raise dish | Arborist trim $150–$400 · or raise height | Worse in summer · improves in winter |
| Bare tree branches | Scattered drops · hard-ish edges | Yes — trim upper branches | Remove specific offending branches | Better in summer with leaves (sound odd but true) |
| Rooflines and eaves | Solid red arc in one direction | Yes — raise dish above roofline | Pole mount or roof peak mount | No — static year-round |
| Chimney | Narrow red arc · hard edge | Yes — reposition dish | Move dish away from chimney’s shadow | No — static year-round |
| Utility poles and wires | Thin arc or intermittent drops | Partial — reposition | Move dish to avoid wire shadow angle | No — static but thin impact |
| Neighboring buildings | Wide hard arc in one direction | Partial — raise dish significantly | Tall pole mount or roof peak above neighbor’s height | No — static year-round |
| Hills and terrain ridges | Hard arc at horizon level · permanent | Very limited — terrain is fixed | Find highest point on property | No — permanent obstruction |
| Mountains or rock faces | Large blocked arc · significant | Extremely limited | May require different service or a relay dish | No — permanent |
| Wind-moved branches | Intermittent · worse in wind | Yes — secure or trim | Trim branches that enter signal path when moved | Varies — worse when leafy and windy |
| Satellite dish or HVAC unit | Narrow hard arc | Yes — relocate interfering object | Move old dish or HVAC clear of Starlink’s cone | No — static year-round |
Understanding the satellite motion problem is what separates people who fix their obstruction correctly from those who reposition their dish five times and still can’t figure out why drops happen.
Starlink’s satellites orbit at approximately 550 kilometers altitude and cross the visible sky in roughly four minutes. Your dish tracks them electronically — not mechanically — using a phased-array antenna that can shift its signal beam without physically rotating. A satellite handoff happens on a globally synchronized schedule roughly every 15 seconds. Each time the dish hands off to a new satellite, that new satellite is approaching from a different direction. This is why the same branch can cause a dropout at 2:15 PM but not at 2:20 PM — at 2:15, the satellite was crossing through the slice of sky that branch occupies. At 2:20, the next satellite approached from a different angle. The drops feel random but are actually perfectly predictable once you know which part of the sky is blocked on your obstruction map.
There are two fundamentally different categories of obstruction and they behave very differently. Hard obstructions are solid, impenetrable objects — rooflines, buildings, chimneys, rock faces, metal structures. When a satellite passes behind a hard obstruction, the signal is gone completely. The dish cannot attempt a handoff and must wait for a satellite on a different path. Hard obstructions show as solid red arcs on the app map and are either fixed by repositioning the dish or aren’t fixable at all. Soft obstructions are trees, foliage, wooden structures, and power lines. These partially attenuate the Ku-band signal rather than blocking it entirely. This sounds less severe, but soft obstructions can actually cause more frustrating user experiences — the dish detects a degraded signal, attempts a handoff, fails partway through, and creates a stuttering connection that’s worse than a clean outage and reconnection.
Starlink’s satellites orbit in shells inclined at about 53 degrees, which means the densest satellite traffic for most U.S. locations travels through the northern portion of the sky. For a home in the contiguous United States — roughly between 25°N and 49°N latitude — the dish naturally leans northward to catch the most satellite passes. An obstruction on the north side of the dish blocks more satellite opportunities per hour than an equal-sized obstruction to the south. This is why a neighbor’s house to the north is more damaging than the same house to the south. When evaluating a mounting position, prioritize northern sky clearance first, then work around south-side obstructions, which have a relatively smaller impact on overall connectivity for most U.S. addresses.
Starlink updated its beam-switching system, announced in August 2025, with enhanced proactive and reactive modes. A U.S. terminal now has tens of satellites in view at any given moment. For a fixed installation that has been operational for at least a few days, the dish builds a real-time obstruction map and uses it to pre-select satellites approaching from clear directions — switching before the blocked satellite creates a dropout. For mobile use, reactive switching triggers in less than 100 milliseconds the moment a signal degrades. Starlink reports that properly installed terminals, even in partially obstructed environments, typically achieve 99.9% uptime with this system. The limit: beam switching can route around small and partial obstructions, but it cannot manufacture a clear satellite when all available paths are blocked simultaneously. A large continuous obstruction — a ridge, a dense forest canopy, a building covering half the sky — exhausts the available satellite options faster than the system can compensate.
Each obstruction type has its own signature in the app, its own seasonal behavior, and its own fix. Identifying which type you’re dealing with is the first step — the right fix for a tree is completely wrong for a roofline.
Trees are responsible for more Starlink obstruction complaints than any other cause. A tree with full leaf cover in summer can add 8–12% obstruction that was only 2–3% the previous winter when bare. Ku-band radio signals (which Starlink uses) pass through light foliage but are significantly attenuated by thick canopy, trunks, and heavy branches. Research conducted at the University of Idaho’s Experimental Forest found that whole tree trunks and branches between the dish and the sky disrupt connectivity more severely than dense foliage canopy does — meaning the thick trunk 40 feet away may cause more dropouts than the leafy canopy overhead. The practical test: if your drops are worse in summer and noticeably better in winter, trees are your obstruction. First fix attempt: identify the specific branches crossing the red zones on the obstruction map and have an arborist remove those specific upper branches — not the whole tree. A targeted trim of $150–$400 often drops obstruction from 15–20% to under 5%. If the tree is too large or close to trim effectively, raising the dish with a pole extension to clear the canopy is the next option.
Terrain obstructions are the hardest to fix because you cannot move or trim a hill. A ridge that blocks the northern sky at a U.S. latitude blocks the highest-density satellite corridor for most of the day. Even a ridge that appears far away can block enough of the lower sky to meaningfully raise obstruction percentages — because satellites approaching at shallow angles from the horizon cross through that blocked zone as they rise. The right diagnostic approach for terrain obstruction: run the Starlink app’s obstruction check from multiple spots across your property — walk uphill, walk to higher ground, try different corners. Properties with a south-facing slope often have acceptable clearance from higher ground that isn’t obvious from the driveway or front door. If every location on the property shows a significant arc blocked by terrain in the northern direction, Starlink performance will be limited by physics and no hardware fix resolves it.
Your own house is one of the most common obstructions — and one of the most fixable. A dish mounted on a wall, fascia board, or low roof position will inevitably have part of the sky blocked by the portion of your roof rising above the mount point. The obstruction map will show a consistent red arc in the direction of the roofline. The fix is almost always straightforward: raise the dish to the roof peak, or use a pole mount that lifts the dish 1–2 feet above the highest roofline point on all sides. A roof peak mount — where the dish sits at or slightly above the ridge — typically provides the cleanest sky view of any residential mounting position. It has 360-degree clearance except for what’s far away in the environment. Chimney mounts can work but require the chimney to be structurally sound, as Starlink dishes create wind loading that old or deteriorated chimneys may not support safely.
A two-story house 6 meters (about 20 feet) away blocks roughly 20 degrees of elevation on that side — which is 5 degrees below Starlink’s minimum recommended clearance and accounts for 10–25% obstruction on its own depending on your dish height. Neighboring buildings are hard obstructions: the signal is fully blocked when a satellite is behind them, with no partial signal to work with. The fix for a neighboring building is height — getting the dish above the blocking roofline. A 20-to-30-foot pole extension or a roof peak mount on your own house raises the dish’s horizon clearance and reduces the building’s blocking angle. Calculate the required height by measuring the neighbor’s roof height and the horizontal distance from your mount — the dish needs to be high enough that a line drawn from the dish to the top of their roofline clears a 25-degree elevation angle.
The number in the Starlink app is not a grade out of 100 — it’s the percentage of critical sky blocked. Even small numbers matter. Here’s what to expect at each level and what use cases hold up versus what doesn’t.
A location that scores 3% obstruction in February can jump to 12% in July when surrounding trees reach full leaf cover. This is one of the most common reasons users report that “Starlink worked great all winter and then started dropping in spring.” The dish isn’t failing — the trees grew into the signal path. If you installed Starlink in fall or winter, re-run the obstruction check in midsummer. If the score has climbed significantly, targeted branch removal to clear the worst-offending trees is the most cost-effective fix.
The obstruction map is the most useful diagnostic tool Starlink gives you — and the most misunderstood. Here’s exactly what you’re looking at and what each visual element means in plain language.
The obstruction map is a circular “fish-eye” representation of the entire sky as seen from your dish. The center of the circle is directly overhead (zenith). The edge of the circle is the horizon — 0 degrees elevation in all directions. The map is oriented to match real-world compass directions. North is typically at the top for U.S. users. A red area near the center means something is blocking the sky almost directly overhead — rare but serious. A red area at the edges means something on or near the horizon is blocking low-elevation satellite paths. Because satellites approach from the horizon as they rise into view, obstructions near the edge of the map catch many more passes per hour than obstructions near the center.
Red areas on the map indicate where satellites have been blocked or attenuated during the observation period. The pattern of the red tells you the type of obstruction. Solid, continuous red arcs with clean edges indicate hard obstructions — buildings, rooflines, solid structures. The edge is sharp because the signal either exists or doesn’t. Scattered, patchy, or irregular red dots and zones indicate soft obstructions — trees, foliage, power lines. The pattern is irregular because attenuation varies depending on how much leaf cover the signal passed through at each satellite position. Wind-moved branches create red areas that appear, disappear, and shift as the obstruction check data accumulates over time.
Many users see a clear white band crossing part of their obstruction map and assume something is wrong. It is not. This band represents the geostationary exclusion zone — the arc of sky where Starlink’s dishes deliberately avoid transmitting to prevent interference with geostationary satellites (the kind used by older satellite TV and internet services) that orbit at 35,000 km and remain fixed above the equator. Starlink’s satellites orbit far lower and are in constant motion, so they never conflict with the geostationary band during normal operation. For most U.S. users, the band falls in a direction and elevation where relatively few Starlink satellites pass anyway, so it has minimal practical impact. Users closer to the equator see this band more prominently because the equatorial direction is more active in their sky.
Starlink’s official documentation states the obstruction map becomes meaningful within the first six hours of operation and more accurate over approximately one week as the dish accumulates data from thousands of satellite passes at all angles. The map automatically updates over time — if leaves grow on a nearby tree, the map incorporates that new obstruction as the dish detects degraded signal on those new satellite paths. Do not make final decisions about dish repositioning based on a map that is less than 24 hours old. A new install in a location with some borderline obstructions may look worse or better in the first few hours than it will after a full week of data collection. Wait at least three to five days before concluding that a repositioning is necessary, unless you can visually identify a clear obstruction in the map that matches a physical object in the environment.
There are exactly four things you can do about an obstruction: run the pre-install check correctly, move the dish, raise the dish, or reduce the obstruction. Which one applies to your situation depends on what type of obstruction you have.
The Starlink app’s built-in obstruction check uses your phone’s camera to scan the sky and predict dropout frequency at that location. It is an extraordinarily useful tool that prevents most obstruction problems — but only if you use it correctly. The most critical instruction: hold your phone at the exact height and position where the dish will be mounted, not at standing height from the ground. For a roof peak mount, get on the roof or use a broom handle extended to roof height. For a wall mount, hold the phone against the wall at the mounting position. Run the check from multiple spots on your roof and property to find which location scores lowest. The Starlink documentation is explicit about this — the tool shows what a dish would see from wherever you’re holding the phone. A ground-level check gives you ground-level results, which are nearly useless for a roof installation.
For tree obstructions, the fastest and cheapest fix is identifying which specific branches are crossing the red zones on your map and having a licensed arborist remove those branches. You don’t need to remove the tree — often three to five upper branches are responsible for 80% of the obstruction. A 30-minute arborist visit to remove specifically identified branches runs $150–$400 and commonly drops obstruction from 15–20% to under 5%. Before calling an arborist, print or screenshot your obstruction map and walk around your dish position looking up — you can usually identify exactly which branch tops correspond to which red zones. Point those out to the arborist specifically. Be realistic about regrowth — trees continue to grow and the trimmed branches will eventually need re-evaluation. Inspect the map each summer and plan for a re-trim every two to three years in most climates.
Raising the dish’s physical height is the most versatile solution — it reduces obstruction from rooflines, neighboring buildings, low trees, and terrain by changing the angle at which the dish sees them. A 20-to-30-foot dedicated pole extension costs $200–$500 for hardware and typically eliminates roofline obstruction entirely. A roof peak mount that positions the dish at the very top of the house gives 360-degree horizontal clearance at the highest point on the structure. Height math: every foot of additional dish height typically reduces the elevation angle to a horizontal obstruction by roughly 1–2 degrees, depending on distance. A neighbor’s roofline that currently blocks 15 degrees of sky at your current mount height may only block 8 degrees from the roof peak — clearing the critical 25-degree threshold for reliable Starlink operation. Starlink sells official mounting hardware through the app. Third-party pole mounts from hardware stores are also compatible.
Sometimes no amount of trimming or raising fixes an obstruction that is fundamentally tied to the property’s terrain or surroundings. A home at the bottom of a north-facing ridge, in a dense urban canyon with tall buildings on all sides, or deep in forest with no clearing has obstructions that no hardware addresses. In these cases, finding a different physical location for the dish — an outbuilding, a higher point on the property, a clearing further from the house — is the only viable solution. The obstruction check should be run at every candidate location before committing. In some cases, users with long properties discover a spot 100 feet from the house that scores under 2% while the house roof scores 20% — and a long Starlink cable run from that location solves the problem entirely. Starlink sells 150-foot (about 45-meter) cables for exactly this use case.
Often yes, but height is the determining factor. The mistake wooded-area customers make is assuming that because trees surround the property, nothing can be done. In most cases, getting the dish above the canopy — either on a dedicated tall pole in a clearing, or on a roof peak that rises above the nearest tree tops — dramatically reduces obstruction. Run the obstruction check from the tallest accessible point on your property first. A point that seems impossibly obstructed from ground level often has a clean sky view from 20 feet up. If you have any location on your land with a significant clearing, run the check there as well. A long cable run from a clearing to the house is a real solution that Starlink’s 150-foot cable makes practical. The properties where wooded Starlink truly doesn’t work are those with a continuous canopy covering every accessible position with no gap — and those are identifiable with two hours of obstruction checking before you spend a cent on hardware.
Wall mounts are one of the most common sources of roofline obstruction. A dish mounted at eave height on the south wall of your house will have the entire roof blocking the northern sky — and for U.S. users, that’s where the most satellite traffic travels. The fix is almost always moving the dish to the roof peak or to a pole that rises above the highest roofline point on all sides. If a roof mount isn’t possible, the next best option is a wall mount on the north side of the house at the highest available position — but be aware that this position still limits northern sky clearance more than a roof peak. Before changing the mount, take a screenshot of your current obstruction map and bring it to the roof peak position — re-run the check there to confirm you’ll actually see improvement before drilling new holes. Most wall-mount users who move to roof peak drop from 10–20% obstruction to under 3%.
This is the classic foliage problem and the diagnosis is almost certain. Deciduous trees that were bare in winter are now blocking your signal with their spring and summer leaf cover. The Ku-band radio frequencies Starlink uses are attenuated by dense leaf matter even when the leaves are too thin to visually block the sky — you can look through them and see light, but the satellite signal cannot pass through the mass of water-laden leaves with the same strength. Open the obstruction map now and compare it to any screenshots you took when the service was working well. You’ll see new red zones where there were none before. Target the specific trees that are newly red on the map — not all the trees. Identifying the two or three that grew into the signal path and trimming those specific branches is faster and cheaper than a comprehensive property trim.
Zero percent obstruction in the app means the dish is not detecting blocked satellite paths — but that doesn’t mean the drops are caused by something else you might expect. The three most common causes of drops with a clean obstruction map are: satellite handoff micro-drops (1–3 seconds, normal behavior as the dish switches between passing satellites), firmware updates (20–60 minute nightly outage when Starlink pushes a software update), and a cable fault (the proprietary cable between dish and router develops a micro-gap, especially after cold weather or wind). Check the app’s outage log under Statistics — if the drops are labeled “Obstructed” despite the map showing clean, run the check again from a slightly different angle. If they’re labeled “No Signal” or are unlabeled brief gaps, you’re looking at handoffs or a cable issue, not an obstruction. A clean obstruction map with a poor cable is a very common combination that wastes time on sky-view diagnostics when the real fix is reseating or replacing the cable.
Mobile use changes the obstruction problem fundamentally. When you’re stationary, Starlink builds an obstruction map over days and uses it to proactively route around known blocks. When you’re moving, every obstruction is new — bridges, overpasses, highway signs, tree-lined roads, tunnels, and your own vehicle’s roof structure all create dynamic obstructions the dish has never seen before. The reactive beam-switching system responds in less than 100 milliseconds, but some obstructions — a long overpass, a tunnel, a tree canopy over a road — last long enough to cause a noticeable drop even with reactive switching. Drops while moving on Roam or mobile plans are expected more frequently than stationary use and are a fundamental characteristic of LEO satellite internet combined with a changing environment. The best RV mount position is flush to the roof with no vehicle structure in the forward and northern sky view. Many RV users also keep a cellular backup connection active while driving and rely on Starlink primarily when parked.
This guide provides general educational information about Starlink satellite internet obstruction. Obstruction percentages, performance thresholds, and fix costs are based on real-world field data and published technical documentation available at time of writing and may vary based on location, hardware generation, satellite density, and individual site conditions. Always use the Starlink app’s official obstruction check tool before making installation decisions. This content is entirely original and independently written.