Northern Ireland poorly served by DAB
There's also the small point that Northern Ireland's only non-BBC multiplex carries about six or seven commercial stations and that's it. Not exactly the hundreds of channels that are touted elsewhere.
Plus the Beeb is having to add seven new transmitters in order to get a half-decent signal out for their channels. The commerical mux is also going to have to expand the transmitter network to improve coverage and signal strength.
I'm also told that the fact that the Republic is still using Band 3 for some of its analogue television signals causes difficulties with DAB transmission in Northern Ireland, so matters may not improve until the South switches that off.