The problem is that DAB uses Band 3 VHF around 200Mhz which means you need more transmitters for a good signal than with FM on 100Mhz as its more easily absorbed by ground clutter and doesn't travel around obstacles as easily. Unfortunately it would appear that Ofcom think because DAB is digital the laws of physics don't apply so it doesn't need any extra TX.
Biting the hand that feeds IT
