I can see polmanter from upstairs in my house and we get all the digital channels - if you put in the post code to the digital coverage site it should tell you as well. Polmanter is high up and gets it's signal from bear a hill called Carn Brea which you should be able to see from the site and you will certainly see on your way down through cornwall, it's very obvious. Do you have a status directional or the older style ufo aerial you will need a directional or a proper aerial to get a decent signal.
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