I've heard they also boost the interference, which I suspect is the cause of the problem.You can get a booster box and they really do work...sometimes..
The Sutton Coldfield transmitter uses horizontal polarisation but I get a better picture with the aerial in a vertical position!... Some signals use vertical polarisation, some use horizontal. Your aerial should be set up to match. The aerial can be rotated through 90 degrees about its length.
Are you sure that you are not picking up a different transmitter!The Sutton Coldfield transmitter uses horizontal polarisation but I get a better picture with the aerial in a vertical position!
Check the com7 mux - it is on reduced power compared to the very high powered other muxes. If the programs on this mux are the ones you are having problems with then you know the basic cause.Have you checked your aerial can actually receive all the MUX's? Here I must have the most broadband aerial possible as the MUX frequencies are spread all over. http://www.ukfree.tv/transmitters/tv/Sutton_Coldfield
According to the 'Properties' screen it's receiving from the West Midlands transmitter, which is Sutton Coldfield.Are you sure that you are not picking up a different transmitter!
I think this could be the answer (or something like it) - all the stations that I have problems with are on the com6 mux. The com7 stations (BBC News, etc) are fine though.Check the com7 mux - it is on reduced power compared to the very high powered other muxes. If the programs on this mux are the ones you are having problems with then you know the basic cause.