Digital radio coverage in the UK is 98% for BBC national stations; 91.5% (Digital One stations) and 83% (Sound Digital stations) for national commercial stations; and 91% for local DAB.
DAB coverage for national commercial stations now exceeds the coverage of national commercial radio on FM and local coverage on DAB matches FM.
You can check your DAB coverage and the stations you can receive by using the Postcode Checker on this site.