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All 4 networks (BBC1, BBC2, ITV & Channel 4) were transmitted from every UHF transmitter AFAIK. This meant you only needed one antenna, usually pointed at the TX nearest to you. My nearest TX is the low power Nottingham relay & I can see it from my garage roof & gives a good signal, but, my antenna is pointed at Waltham a high power TX about 30 odd miles away, I used to be on Nottingham TX but nearly every time it thunders it goes off air for hours because of nearby lightning strikes, when Waltham has a lightning strike it goes off for about ten seconds then comes back on again, presume in has extra protection because it's a main high power TX...
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