UKThe map
Every UK television, FM and DAB transmitter, where it stands. Click one for what it carries, or shade the ground by how many transmitters reach it.
The transmitters
Every mast Ofcom publishes for this band, where it stands. Click one for what it carries, how far it reaches and which way to point an aerial. Choose a shading above to colour the ground as well.
How many transmitters reach here
- 7 or more
- 4 to 6
- 2 or 3
- 1 transmitter
Every transmitter of this kind the model predicts will reach an area, counted — not just the best one. This is the map of how much choice a place has, and it is the one that shows where there is none.
The strongest one here
- Should be reliable10 dB or better
- Should work3 dB or better
- Borderline0 dB or better
- Unlikely to workbelow threshold, or nothing predicted
Each area coloured by its best transmitter of that kind — the one the postcode lookup would recommend. It is not where any one transmitter reaches: a mast can be receivable across a county and be the strongest in none of it. Grey means nothing of that kind is predicted to reach.
What you are looking at
Ofcom's published transmitter list, on a map. The shadings are this site's own model rather than anybody's measurements. For a specific address, the signal lookup on the front page writes the same model's answer out in full.
More detail
The country is divided into the 238,895 Census Output Areas the predictions were made for — roughly 130 households each. The boundaries between colours are the places where the answer changes, or where the ground gets in the way. Each prediction is P.1812 over 50 m terrain data; the method page sets out what that does and does not account for.