don't bother mate they are terrible, i put one in my wife car not that long ago and ripped it out within a few days and went back to oem then got a refund.
the channels never stay on long and cut out constantly everywhere we went, we had a dual din jvc in there. I just think that DAB is a poor concept now - ok for the home radio that stays put but as a mobile media its awful.
your far better off with a streaming app like tune in radio if you have an android phone - the quality is much better and cuts out far less often depending on your phones network.
For dab i got better results from a Walkman type of dab radio.
what i do now is have a head unit with capable Bluetooth streaming and use tune in radio - Ive driven from basildon to alton towers with about 3 or 4 drops outs on the giffgaff network (on o2)(on DAB i would have had that many drop outs before leaving basildon), you just need a good data plan that most people already have.
I cant imagine the government now switching of the FM channels as DAB has never really taken off like digital tv. Get yourself a nice head unit with parrot Bluetooth over DAB gimmick - also the glitching is not good for your ears let alone your car speakers lol.