Strictly speaking there are no such things as digital 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 Aerial’ is an aerial that is digitally compatible and more often than not ‘wideband’. A high gain version of this type of aerial is one which has been designed in such a way as to increase the amount of signal it is able to receive over that of a standard aerial. This ‘high gain’ quality, increases the capability of receiving signals in marginal reception areas.
Also ensuring an aerial is digitally compatible is the use of screened components to reduce the ingress of interference.
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