BBC Radio Ulster lost 56,000 listeners in the last quarter of 2009, according to Rajar figures.
Overall, the station showed a drop of 19,000 listeners from this time last year, with 498,000 tuning in to Radio Ulster compared to 517,000 in the last quarter of 2008.
The Stephen Nolan Show (slogan: ‘The biggest show in the country’) dropped 14,000 listeners, from 153,000 to 139,000, but remains the station’s most listened-to programme.
Good Morning Ulster, which saw a line-up change last year, saw a dip in listeners from 110,000 to 102,000. Downtown Radio and Cool FM’s combined figures showed an increase of 39,000 new listeners, taking their total weekly reach to 537,000 adults.
Citybeat’s figure for the last quarter of 2009 was 128,000 while U105’s was 136,000.
A BBC spokesman said: “These figures show that our listeners are continuing to enjoy the range and breadth of output across BBC Radio Ulster.”