In reply to a lakeland climber:
> You'd need a digital specific aerial so even if it had one you'd be better off replacing it.
Utterly untrue. There is no such thing as a "digital specific" aerial. The radio waves are exactly the same, which is all that matters to the aerial. All that's different is what's modulated on to the radio waves, and you need a digital tuner to sort that out (much like the difference between AM and FM - or indeed FM and DAB, and you'll notice that DAB radios have a ferrite rod and a stick aerial just like AM/FM radios).
Prior to switchover, when Freeview was being broadcast (from a limited number of transmitters) alongside the analogue channels, the digital multiplexes had to be broadcast on different UHF channels to those used for the analogue TV stations. Those extra UHF channels often fell outside the group of UHF channels used for analogue, so to receive them you needed a wideband aerial rather one optimised to receive the tighter group of UHF channels used for the analogue service. This lead to retailers labelling wideband aerials as "digital", although there was nothing about people's old aerials that made them unsuitable for digital TV beyond the fact that they couldn't receive the UHF channels that the digital multiplexes were broadcast on.
Now that there are no more analogue channels left, in 90% or more of the UK the digital multiplexes are broadcast on the
same UHF channel groups that were previously used for analogue TV. (That's what happened in the Digital Switch Over events in each region - the digital multiplexes took over the old analogue UHF frequencies.) So an aerial that worked for analogue then will work for digital now.
End of rant.