I have a 1991 Mazda MX5, currently in the UK and considering adding a DAB radio before moving to Switzerland.
Do I also need to install a DAB ariel/antenna ?
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No - although you will need an antenna splitter (something like this) as the DAB aerial connector is different.
As a side note you'll also want to ensure that the headunit you buy has DAB+ compatibility - most new kit now should have it but it's going to be unpleasant if it doesn't and you get to Switzerland where the vast majority of stations are DAB+.