Back in March 2009, I added in coloured bars to to show the Aerial groups associated with each of the UHF broadcast frequencies.
I had taken a somewhat "absolute" view of the groups, following the "official" allocations:
In response to the possibilities of three new multiplexes, I have now introduced a more sophisticated version of the colour bars, where frequencies that are out of group, but still provide some signal are indicated with a lighter shade of the group's colour:
This follows the "ITC reference" values that Ofcom and Arqiva use:
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My guess is that you are receiving your signal from the Lark Stoketransmitter. Is your aerial pointing South West? If so, I think your signal may be too strong, as it is only six miles away from you. Please see