Dish Size Guide 2026: Choose the Right Satellite Dish

Updated: October 24, 2026 (8:00 PM PKT) — 1BissKey's practical evergreen guide to choosing the right satellite dish size: what Ku-band and C-band really need, how footprints and signal strength decide the size, and the mistakes that cost viewers a stable picture.

Ask ten installers what size dish you need and you may get ten different answers — because there is no single right answer. The correct dish size depends on which band you receive, which satellite and transponder you want, and how strong its signal is where you live. A 60 cm dish that works perfectly in a strong-signal zone can be useless on the same satellite 500 km away, at the edge of its footprint. This guide explains the rules behind dish sizing so you can buy once, buy right, and stop chasing "No Signal" errors that a correctly sized dish would have prevented.

⚡ Quick answer: For strong Ku-band DTH signals, 60–75 cm is usually enough. For weaker Ku-band signals, fringe reception or heavy-rain areas, step up to 90–120 cm. For C-band, think in metres, not centimetres — typically 1.8 m and larger. Always check the satellite's footprint map and EIRP for your location first (LyngSat and KingOfSat publish them): the footprint, not the shopkeeper, decides your size.

60–75 cm

Typical strong-zone Ku-band DTH dish

90–120 cm

Weak-signal, fringe or rain-prone Ku-band

1.8 m+

Typical C-band starting point

~6 dB

Approx. gain from doubling dish diameter

Contents

• Why dish size matters at all
• Footprints and EIRP: the map that decides your size
• Ku-band vs. C-band size rules
• The size picker: which dish for your situation
• Solid vs. mesh, offset vs. prime focus
• 5 sizing mistakes to avoid
• Before you buy: the checklist
• Safety
• FAQ
• Sources

Why Dish Size Matters at All

A satellite dish is a collector: it gathers the faint microwave signal spread over a wide area and focuses it onto the LNB feed horn. The bigger the collecting area, the more signal energy reaches the LNB, and the higher the antenna gain. Gain rises with the square of the diameter — so, in theory, doubling the diameter adds about 6 dB of gain (real dishes land a little below theory because of surface accuracy and feed efficiency, but the rule of thumb holds).

That extra gain is your safety margin. It is what keeps the picture up when rain weakens the signal (see our Rain Fade Fix guide), when you aim at a weaker transponder on the same satellite, or when your LNB ages and its noise figure creeps up. An undersized dish may show full signal on strong channels and nothing on weak ones — the classic symptom is not "no signal everywhere" but "some channels missing".

Size also affects beamwidth: bigger dishes see a narrower slice of sky. That is usually good — a narrow beam rejects interference from neighbouring satellites — but it also means aiming must be more precise. A 2.4 m dish that is a degree off-peak loses more than a 60 cm dish with the same error, so big dishes reward careful peaking (our Satellite Finder Guide 2026 covers the technique).

Footprints and EIRP: The Map That Decides Your Size

Every satellite beam paints a footprint on the Earth — a coverage map showing where its signal lands and how strong it is. Signal strength on these maps is quoted as EIRP (Effective Isotropic Radiated Power), in dBW: higher dBW means a stronger signal at your location, and a smaller dish will do.

The centre of a beam is always strongest. Move toward the edge of the footprint and the EIRP falls, sometimes by several dB — which is why the same satellite needs a 60 cm dish in one country and a 120 cm dish in another. Footprint maps are published by the satellite operators and mirrored on LyngSat and KingOfSat; find your town on the map, read the EIRP contour, and size from that — not from what worked for a friend in a different city.

Three practical rules follow from this:

• Strong centre, small dish: high-power DTH beams are deliberately designed for small home dishes — commonly 45–60 cm in their core coverage area.
• Fringe or edge, bigger dish: every dB the footprint loses at the edge must be won back with dish area. Going one size up is the cheapest fix for fringe reception.
• Rain margin on top: in heavy-rain climates, size for the worst weather, not the clear-sky reading. A dish that only just locks in sunshine will be the first to fail in a storm.

Ku-Band vs. C-Band Size Rules

The two TV bands live in different size worlds, because C-band signals use longer wavelengths and are typically broadcast at lower power density for home reception. Published band comparisons put typical dish sizes at 60–120 cm for Ku-band and 1.8–3.8 m and larger for C-band, and general satellite guides agree: a C-band dish is usually 2 m or larger, while Ku-band dishes range from about 65 cm upward.

Band	Downlink frequency	Typical home dish size	Dish style
Ku-band	10.7–12.75 GHz	60–120 cm	Solid offset dish, Ku LNB
C-band	3.4–4.2 GHz	1.8 m and larger (often 2.4 m)	Prime-focus dish, often mesh, C-band LNB
Ka-band	17.7–21.2 GHz downlink	45–90 cm (consumer broadband)	Small solid dish, broadband terminal

Why C-band dishes are so big: at 4 GHz the wavelength is roughly three times longer than at 12 GHz, so the same gain needs a much larger reflector — and C-band feeds are usually received from satellites whose beams are not shaped for tiny home dishes. A mesh surface works fine at C-band because the longer waves do not "see" the holes; at Ku-band the same mesh would leak signal, which is why Ku dishes are solid with a smooth, accurately shaped surface.

The Size Picker: Which Dish for Your Situation

Your situation	Start with	Go bigger if…
Strong-signal DTH in the beam centre	60–75 cm Ku	You also want weak transponders on the same satellite
Fringe / edge-of-footprint reception	90–120 cm Ku	The footprint map shows you outside the strong contour
Heavy-rain area, Ku-band	90 cm Ku minimum	Outages already happen in every storm — add rain margin
Multi-satellite / motorised setup	90–120 cm Ku	Some of your target satellites are weaker than others
C-band feeds and channels	1.8–2.4 m C-band	You are at the footprint edge or want the weakest feeds
Weak-signal / DX hobby reception	120 cm Ku or 2.4 m+ C-band	You are chasing signals not meant for your region

When in doubt between two sizes, buy the larger one — provided your mount, wall or pole can hold it. The price difference between a 75 cm and a 90 cm Ku dish is small; the signal difference in bad weather is not. The one exception is a genuinely wind-exposed rooftop, where a very large dish becomes a sail (see Mistakes below).

Solid vs. Mesh, Offset vs. Prime Focus

Offset dishes (the familiar oval DTH dish) put the LNB below the centre of the reflector, so the feed arm never blocks the signal path. Almost all Ku-band home dishes are offset, solid steel or aluminium. Prime-focus dishes put the LNB dead centre on arms from the rim; most large C-band dishes are prime focus, and many are mesh, which cuts wind load and weight at big diameters.

Do not mix and match blindly: a Ku-band LNB on a mesh C-band dish, or a C-band feed on a small offset dish, will underperform no matter how carefully you aim. Match the feed, LNB and dish type to the band, and check the dish's f/D ratio suits the feed horn if you are building a prime-focus setup from parts. For a standard home install, a matched dish-plus-LNB kit removes all of this guesswork.

5 Sizing Mistakes to Avoid

1. Buying by what the neighbour has

Your neighbour may watch a different satellite, a stronger beam, or only the strong transponders. Size from the footprint map for your satellite and your weakest wanted transponder.

2. Measuring an offset dish wrong

Offset dishes are wider than they are tall. Sellers usually quote the width, but some quote the height or an average — compare like with like, and be suspicious of a "90 cm" dish that measures 80 cm across.

3. Putting a big dish on a weak mount

A 1.8 m+ dish on a thin pole or a crumbling wall bracket will flex in wind, and a flexing dish loses signal exactly when storms hit. Big dishes need a proper ground or heavy-duty wall mount, through-bolted — see our Mounting Guide.

4. Expecting size to fix a bad cable or dying LNB

A bigger dish cannot rescue water-damaged connectors, a kinked coax run or a failing LNB. If some polarities or bands are missing entirely, suspect the feed chain first — our No-Signal Troubleshooting Guide walks through the checks.

5. Oversizing into adjacent-satellite interference

On crowded orbital slots, an oversized, poorly aimed dish can pull in a neighbouring satellite's signal on the same frequency. If a bigger dish makes things worse, re-peak carefully on the wanted satellite's weakest transponder before blaming the hardware.

Before You Buy: The Checklist

• Satellite + transponders: write down exactly which satellite and channels you want — size for the weakest one, not the strongest.
• Footprint EIRP: check LyngSat or KingOfSat for your location and note the dBW contour you sit on.
• Band: Ku-band (60–120 cm world) or C-band (metres world) — never buy one size for both.
• Mount: can your wall, pole or roof safely hold the dish you are about to buy, in high wind?
• LNB match: Ku LNB for a Ku dish, C-band LNB and feed for a C-band dish; universal Ku LNBs cover 10.7–12.75 GHz.
• Cable run: keep the coax run short and well-routed — long, lossy cable eats the gain you just paid for (see our Cable Guide).
• Future plans: if a motorised or multi-satellite upgrade is likely, buy the larger Ku size now rather than replacing the dish later.

Safety

Large dishes are heavy and catch wind like sails. Never install a big dish alone on a roof edge, never work on a dish during a thunderstorm or in high wind, and always use a second person to hold and steady a 1.8 m+ reflector while it is bolted up. Ground the installation properly and keep the dish clear of power lines — a dish that can touch a power line if it falls is installed in the wrong place.

Frequently Asked Questions

Can I use a 60 cm dish for C-band?
No — C-band needs a much larger collecting area. A 60 cm dish will not reliably receive C-band feeds; start at 1.8 m and check the footprint.

Will a bigger dish give me more channels?
Only if the missing channels are weak-signal ones on satellites you can already see. A bigger dish cannot receive a satellite below your horizon or outside its footprint.

Is a 90 cm dish always better than a 60 cm dish?
For signal margin, yes — but only if it is well aimed and well mounted. A badly aimed 90 cm dish loses to a well-peaked 60 cm dish on a strong signal.

How do I know my footprint EIRP?
Find your satellite on LyngSat or KingOfSat, open its beam/footprint map, and locate your town. The contour lines are labelled in dBW; lower dBW at your location means you need a bigger dish.

Do mesh dishes work for Ku-band?
Not well. Mesh leaks Ku-band's shorter waves, so Ku reception needs a solid, accurately shaped reflector. Mesh is a C-band solution.

Can one dish serve Ku and C-band together?
Only with a combined feed and a large prime-focus dish (typically 1.8 m+), carefully set up. For most viewers, separate correctly sized dishes are simpler and more reliable.

📚 Related Posts

• Rain Fade Fix: Weatherproof Your Satellite Dish 2026
• Satellite Finder Guide 2026: Aim Your Dish Like a Pro
• Satellite Dish Cable Guide 2026: RG6, F-Connectors & Grounding
• C-Band vs Ku-Band Dish Setup Guide 2026
• Satellite Dish Mounting Guide 2026
• No-Signal Satellite Dish Troubleshooting Guide 2026
• 1BissKey New Look October 2026: Receiver Updates
• Paksat 1R Complete Channel List with Frequency

Sources

• Dolph Microwave — "What is the size of earth station antenna" (DTH 45–60 cm, VSAT 1.2–1.8 m, C-band 2.4–3.7 m pairings; 50–54 dBW EIRP DTH design point): dolphmicrowave.com
• Wintal Satellite TV Guide (C-band 3.4–4.2 GHz, Ku-band 11–12.75 GHz; C-band dishes usually 2 m+, Ku 65 cm–2 m; mesh vs solid surface accuracy): wintal.com.au
• Optisat — C-Band vs Ku-Band vs Ka-Band comparison (typical dish sizes: C-band 1.8–3.8 m+, Ku-band 60–120 cm): optisat.blogspot.com
• LyngSat — satellite footprint and EIRP maps: lyngsat.com
• KingOfSat — satellite charts, footprints and transponder news: kingofsat.net

Disclaimer: This is an evergreen educational guide. Dish sizes quoted are typical ranges for planning — your exact requirement depends on the satellite footprint and EIRP at your location, so always check the footprint map before buying. No satellite keys or decryption material are included in this guide.