I have several pocket sized and portable DAB radios and have found their use outdoors, on the move, extremely frustrating. It's virtually impossible to keep a good strong DAB signal in built up areas and the result is a very unpleasant and frustrating assault on the ears. I've never been able to get any sort of DAB signal in the car or on a train.
My iRiverB20 cost about £80 and probably has all the stuff you need as well as an additional outdoor antenna for DAB reception but the problem persists.
http://www.bestdigitalmarket.com/vie...dio+MP3+Player
For me DAB on the move is a pipe dream sadly.