DAB radio reception problems.

[Squirrelly]

I've been happily listening to DAB radio in my 2013 A4 Avant 1.8 TFSI Black edition for years now perfectly well, but just recently over he last couple of months the signal has deteriorated through broken reception to the point now when the channels have all but disappeared completely.

Is anyone aware of recent signal problems in the Chester/North West area or do I have a problem with the car's Arial?