DAB Licence is like £200 a year, then you just need carriage on a MUX (not that expensive) and to pay the PRS - and away you go.
Centreforce 883 is a case in point...
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Back home now, Mix FM might be on to something with that 88.6 Dead Carrier - I've got something fighting Radio 2 (Ridge Hill, 88.6) here which is just making a mess. Usually R2 88.6 is a reasonable signal.