I’ve been installing satellite dishes for over 15 years, and I’ve seen the same mistakes repeated by DIY enthusiasts and even some so-called professionals. This guide isn’t about theory—it’s about what works in the real world, on windy rooftops and in cramped back gardens. If you follow these practices, you’ll get a rock-solid signal and a setup that lasts a decade or more. Skip a step, and you’ll be back on the ladder in six months, swearing at a pixelated screen.
Site Survey: Reading the Sky Before Touching a Bracket
Before you even unpack the dish, you need to understand what’s between your mounting point and the satellite. For most European installations, you’re aiming at Astra 2 at 28.2°E. That’s a specific spot in the sky—roughly 25° elevation in southern England, higher as you go north. A compass and a basic inclinometer app on your phone will get you started, but you must account for magnetic declination. In the UK, true south differs from magnetic south by about 2-3° depending on your location. Ignoring this will send your dish pointing into empty space.
Check for immediate obstructions: chimney stacks, neighbouring buildings, tree branches that will grow. I once revisited a job where a beautiful signal had vanished—a neighbour’s new extension blocked the line of sight. Use a site survey tool like a satellite finder with a spectrum display, not just a beeping meter. The beeping meters lie in urban areas where reflected signals bounce off walls.
Using DishPointer and Physical Checks
Apps like DishPointer give you an augmented reality view of the satellite arc. They’re handy, but I treat them as a starting point. The compass in your phone is easily distorted by metal objects—like the dish itself or the wall you’re standing next to. I always carry a proper orienteering compass and a clinometer. Stand at the proposed mount location, sight along the bearing, and physically check that you have a clear window. The signal from a satellite at 28.2°E is surprisingly weak; it’s about the same as a 60-watt light bulb in Frankfurt, 36,000 km away. Even wet leaves in the path can attenuate it.
Mounting: The Foundation That Determines Everything
I’ve seen too many dishes flapping in the wind because someone used four rawlplugs in crumbling mortar. The mount must be absolutely rigid. A dish is a sail—a 60 cm dish in a 50 mph gust can exert over 10 kg of force. The bracket you choose depends on the wall or surface. For brick, I use M8 Fischer SX plugs with stainless coach screws; for concrete, M10 through-bolts with chemical anchors if the concrete is old. Never mount to a chimney stack without a specialist lashing kit, and even then, check the mortar condition. A chimney fire or just years of thermal cycling can leave it brittle.
Pole or Wall: Making the Right Choice
A wall mount is simpler, but you’re limited to the wall’s alignment. If the wall faces 10° away from the satellite, you’ll need a cranked bracket or a longer arm. I prefer a T&K bracket system for most installations—two brackets, a metre apart, holding a 2-inch galvanised steel pole. This gives you flexibility to adjust the pole for plumb and rotate the dish independently. It also gets the dish away from the wall, reducing reflections that can cause ghosting on some receivers.
If you’re ground-mounting, the pole must be set in a concrete base at least 500 mm square and 600 mm deep. Use a spirit level when the concrete is wet, and check it again after 24 hours. A pole that’s 2° off vertical will make tracking the satellite arc a nightmare. I weld a small steel plate to the bottom of the pole to prevent rotation in the concrete—a trick I learned after a customer’s dog kept bumping the dish out of alignment.
Assembly and Alignment: Precision Over Guesswork
Assemble the dish on the ground, but leave the bolts finger-tight. Check the dish face for warping—I’ve had new dishes arrive with a 3 mm distortion from a factory drop. Lay a straight edge across the rim; any gap over 1 mm will degrade performance at Ka-band frequencies. The LNB arm must be straight and the LNB itself positioned exactly at the focal point. For an offset dish, the LNB looks up into the dish face, not at the centre. Many DIY failures come from mounting the LNB upside down or too far forward.
When you hoist the assembly onto the pole, get it roughly aligned before tightening anything. I use a satellite meter with a numeric signal quality readout, not just a strength meter. Signal strength tells you the LNB is powered; quality tells you it’s locked onto the correct satellite. Start with the dish at the approximate elevation, then pan slowly across the azimuth. Astra 2 has a distinctive signal pattern—a strong transponder at 10714 H, 22000, 5/6. If your meter shows a lock on that, you’re on the right bird. Then tweak elevation for maximum quality, then azimuth again, then skew. Skew is the LNB rotation; for Astra 2 in the UK, it’s about -13° clockwise when looking into the dish. Get it wrong, and you’ll lose the vertical polarisation signals.
Fine-Tuning Without Expensive Gear
If you don’t have a pro meter, you can use the receiver’s signal display—but it’s slow. The on-screen bar updates every second or two, so you’ll overshoot the peak. I used to take a small portable TV and receiver up the ladder. These days, a cheap satellite finder with a spectrum display costs about £60 and pays for itself in one afternoon. Alternatively, use a smartphone app that talks to an Enigma2 receiver over the network; you can watch the SNR in real time while adjusting.
Once you’ve got peak signal on one transponder, check a few others across the band. A dish that’s not tracking the arc properly will show good signal at the centre but drop off at the extremes. If the low-band transponders are weak, your elevation is slightly off; if the high-band ones fail, adjust the declination or check the LNB skew again. I’ve spent 20 minutes doing this dance on a tricky install, but once it’s locked, it stays locked.
Cabling: The Veins of the System
You can have the perfect dish alignment, but if your cable is rubbish, you’ll get pixelation and dropouts in the rain. Use only solid copper core, copper braid coaxial cable—WF100 or equivalent. Avoid the cheaper CCS (copper-clad steel) cable; it’s lossy and a nightmare to terminate properly. For runs over 20 metres, consider WF125 or add a line amplifier, but only if the signal at the dish is already solid. Amplifying noise gets you nowhere.
Waterproof every outdoor connection. I use self-amalgamating tape, stretched tight and overlapped, then a layer of PVC tape for UV protection. Don’t rely on the rubber boot that comes with the LNB; they trap moisture. Make a drip loop where the cable enters the wall—water follows cables, and a loop forces it to drip off before reaching the hole. Seal the hole with silicone on both sides, but leave a tiny weep hole at the bottom of the external seal if the wall cavity might collect water.
Earthing and Lightning Protection
The regs are clear: the dish and cable screen must be bonded to the building’s earth system. A satellite dish isn’t a lightning rod, but it can accumulate static and it’s a metal object on the roof. I run a 4 mm² earth cable from the dish mount to the nearest earth point—usually the main earth terminal or a dedicated earth rod. The coax screen should be earthed via a ground block near the entry point. In areas with high lightning risk, I fit an inline surge protector; it’s a ten-quid part that can save a TV and a satellite receiver from a nearby strike.
Common Pitfalls and How to Avoid Them
One: mounting too high. I get it—you want to clear obstacles. But the higher you go, the more wind load and the harder the maintenance. Two: ignoring the sun outage. Twice a year, the sun passes directly behind the satellite, and its noise swamps the signal for a few minutes. If your customer calls in March or October complaining of a daily blackout at the same time, it’s not a fault—it’s physics. Three: using a universal LNB on a multi-feed setup. For multi-satellite, you need narrow-feed LNBs or a monoblock, and the dish must be slightly larger to maintain gain at the edges.
I’ve also seen corrosion eat through an aluminium dish in five years because it was mounted with steel bolts without isolation. Use stainless steel hardware and, if you’re near the sea, a marine-grade dish with a powder-coated finish. Rinse it with fresh water annually to remove salt.
Testing and Handover: Leaving the System Solid
After alignment, torque all bolts to spec—no overtightening, which can strip threads or warp the dish. Run a BER (bit error rate) test if your meter supports it. Aim for a post-Viterbi BER of 10^-7 or better; anything above 10^-5 will show visible artifacts. Check all channels, including the weakest ones in your package. I keep a list of problematic transponders for Astra 2 and Hotbird.
Show the customer the signal quality screen and explain that rain fade is normal—heavy rain can attenuate the signal by 10 dB or more. If they have a properly aligned dish with a margin of 5-6 dB above threshold, they’ll only lose signal in a monsoon. Adjust the LNB skew for their specific location if you’ve used a generic setting; a difference of 2° can matter on fringe reception areas like Scotland or the Algarve.
FAQ: Satellite Dish Installation Questions
Can I install a satellite dish myself, or do I need a professional?
You can do it yourself if you’re comfortable with heights, power tools, and precise alignment. The tricky part isn’t the physical mounting—it’s the final alignment to within a degree. A professional installer has a meter that shows the signal quality instantly, which saves hours. If you’re in a strong signal area like central England, DIY is viable with patience. In fringe areas like northern Scotland, pay for a pro.
What size dish do I need for Freesat or Sky in the UK?
For most of the UK, a 45 cm dish is the standard and works well. In heavy rain areas or the far north, go for a 60 cm dish to gain a couple of dB of margin. If you’re in Scotland or want reliable reception during thunderstorms, a 70 cm dish is a small extra cost for peace of mind. Don’t assume bigger is always better—a larger dish has a narrower beamwidth, which makes alignment more critical.
How do I stop my satellite dish from moving in the wind?
Wind movement comes from a poor mount. Use a T&K bracket system with a 2-inch pole, firmly fixed to a solid wall. Check the bolts annually. If the dish is on a chimney, the lashing kit must be tight and the chimney in good condition. A dish that’s properly mounted will flex slightly in extreme wind but return to position; if it’s shifting, the mounting bolts are loose or the wall anchors are failing.
Why does my satellite signal drop out when it rains?
Rain fade is caused by water droplets absorbing and scattering the microwave signal. A well-aligned dish with a clear line of sight will have a signal margin that copes with light to moderate rain. If you lose signal in light rain, your dish is slightly off alignment, the LNB is failing, or there’s water in the cable connections. Check the waterproofing and realign before replacing parts.
Remember: a satellite dish is a precision instrument. Treat it like one, and it will deliver perfect pictures for years. Rush the job, and you’ll be chasing your tail with intermittent faults that drive you mad. I’ve learned these lessons the hard way, on cold roofs and in sweltering attics, so you don’t have to.