Digital UK - TV Explained: "Television signals can be received via an aerial, satellite, cable or broadband connection. Switchover affects any TV that receives its signal from an aerial.
If you use an aerial, it will receive its signal from a transmitter. In the UK, there are more than 1,150 transmitters organised into around 80 transmitter groups that will switch to digital one by one. Each group has a main switchover transmitter and local relay transmitters.
Before switchover, local relay transmitters are only able to transmit an analogue TV signal. After switchover, for the first time, local relay transmitters will transmit a digital signal and increase the number of channels available from around 5 to around 15.
Why is it important that I understand which transmitter I am watching?"
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