I receive my TV channels from the Heathfield Transmitter but cannot receive channel 40 but instead get channel 29 which comes from the Midhurst transmitter and when I try and watch it I get the message no signal.I have done a manual search and changed 29 to 40 but when I go back to watch the TV it has gone back to channel 29.I have also tried unplugging the aerial from the TV and doing a digital search and then doing another digital search but it made no difference.It has the latest software.Any advice appreciated.The TV is a Sony KDL-42W653A
