Strictly speaking there are no such things as digital TV aerials, as digital TV signals use the same frequency bands as analogue signals. Therefore an aerial often sold as an ‘analogue’ antenna will pick up digital signals.
What is usually meant by the term ‘Digital TV Aerial’ is an aerial that is digitally compatible and more often than not ‘wideband’.
Traditionally aerials sold for analogue use are known as grouped aerials, which mean they will only work over a selected range of channels in the available bandwidth. This was very useful when there were only four TV channels as these aerials reduced interference from other transmitters. However, when Channel 5 and digital transmissions developed there was often not enough space in the in the grouped bandwidths to fit the extra channels in so they had to fit in areas outside the grouped aerials capability and could not therefore be received.
In order to receive the full range of signals wideband aerials are used. As the name suggests wideband aerials are able to receive the full TV bandwidth and are capable of receiving all the analogue and digital transmissions.
Also ensuring an aerial in digitally compatible is the use of screened components to reduce the ingress of interference.
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