One of the most common questions when buying an LNB is how many outputs you need. Get it wrong and you either pay for outputs you will never use, or — worse — you run out and have to climb back up the dish.

The Rule: One Output Per Receiver Tuner

Each output on a multi-output LNB is a completely independent feed. A twin LNB runs two receivers; a quad runs four. You cannot split one output to feed two receivers (that causes voltage conflicts). So count your receivers and tuners.

Single LNB: One Box, One TV

If you have exactly one satellite receiver and one TV, a single-output LNB is all you need. It is the cheapest and has the lowest noise figure. There is no point buying a quad if you only have one box.

Twin LNB: Two Rooms

A twin LNB feeds two independent receivers. Typical uses: TV in the living room plus a second TV in the bedroom; or a twin-tuner PVR that needs two feeds for recording while watching.

Quad LNB: The Family Default

Four outputs. Covers most family homes: a PVR (two feeds), a bedroom box, and a spare. Add this if you might expand later.

Octo and Beyond

Eight outputs for larger homes. Beyond that, you use a “multiswitch” that feeds a whole apartment block.

Always Add Spare Outputs

The cost difference between a twin and a quad LNB is small. The labour cost of upgrading later — another ladder trip, another alignment — is not. If you are in any doubt, go one size up. An unused output costs nothing.

What Not to Do

• Do not use a passive splitter on a single LNB output — the two receivers' voltage commands conflict and you will get half channels.
• Do not buy a twin LNB to feed a twin-tuner PVR — that works, but only if the PVR is the only thing connected.
• Do not forget the Sky Q / Freesat 4K wideband standard — those boxes need a specific LNB regardless of output count.

Count your tuners, add two spares, and buy once. The output count is the one LNB spec you cannot upgrade in software.