DAB is a geriatric solution to a problem that does not exist.
Originally conceived as a way of automating radio listening so that people did not have to re-tune their car radios as they drove along, or suffer fading from multipath it was also adapted to increase the number of channels available by TDM. But we are not short of FM spectrum, particularly when so many local commercial radio stations have been merged into national conglomerates. And a serious attempt to measure the artistic quality would be very disappointing. Very dissapointing indeed.
The battery consumption of portables is appalling, and the level of technology required means that cheap radio is impossible. And the abysmal bit rates drive the final nail into the coffin from my point of view.
Oh, and as early adopters, nay originators, we are lumbered with a system that the rest of the world has moved on from.
We have internet capacity enough and satellite channels that cover all the stations (although the satellite channels are under-utilised, being fed from the low bit rate DAB channel in too many cases). Our american cousins, for all their failings, have adopted satellite receivers for cars rather than DAB, and we could do the same. On the subject of internet capacity, that could be improved if ISPs put simple caching servers in the exchanges, so that multiple consumers of radio or tv could be given a single feed over the backbone, rather than multiple identical feeds occupying bandwidth.
And yes, I live in an area which is "marginal" for DAB, but then it is "marginal" for FM, DVT, rdio 5 MW, and broadband as well. If DAB were any good I'd be putting up antennae