Most older aerials in our county recieve their signal from the Sandy Heath transmitter. Our analogue TV channels (BBC1, 2, ITV & C4) are broadcast on frequencies (channels) 21 to 31. To Give the best reception and avoid interference aerials were fitted to give maximum gain from these frequencies only.
Digital TV channels are broadcast from Sandy Heath in the higher frequencies (channels 40 to 67).
For you to recieve digital TV you will need an aerial that picks up from all of the channels in the TV frequency range (channels 21 to 68). This type of aerial is called a wideband aerial