Chrysalis-owned 100.7 Heart fm has toppled BBC Radio 1 and 2 to become the most listened to station in the West Midlands, it has claimed.
According to the latest quarterly industry statistics, the commercial station has seen the number of people tuning in during an average week increase by 11,000 to 840,000.
A spokeswoman said the RAJAR figures mean the station had a greater audience, in what is known as "weekly reach", than any station in the region.
She said statistics supplied to it by RAJAR showed Radio 1 was down in the region to 819,000 from 830,000 and Radio 2 stood at 836,000 from 851,000.
A spokeswoman for the BBC could not comment on the figures, saying they were supplied to commercial stations and not the corporation.
Paul Fairburn, managing director of Heart, said: "The fact that we continue to be the biggest commercial radio station in the West Midlands is always something to celebrate.
"Now that we've overtaken both the BBC's two biggest stations in our area, it shows that our recent line-up changes and our TV marketing have been very successful."
The latest RAJAR figures come after an intensive TV advertising campaign called "Overwashed" nudged up awareness of the station Heart checked out its success by carrying out an in-house study asking people to spontaneously name a radio station which they listen to in their area.
The station said more than 69 per cent recalled 100.7 Heart fm - a four per cent rise from a similar survey before the TV campaign was launched. "Overwashed", features a woman who is cleaning her car while listening to Heart on the radio. She gets so engrossed that she finds she's washed the paint off when she clears the suds with a bucket of water.
Heart's sister station Galaxy Birmingham fared less well, with its reach down from 337,000 to 311,000.
However, EMAP-owned guitar rock station Kerrang! 105.2 - which was launched in 2004 - celebrated a further increase in weekly reach to 366,000 from 354,000.
Brand manager Andy Price said: "We've seen, apart from one blip, a steady line of increase since launch which is very pleasing."
GCap's BRMB saw a rise in its reach to 532,000 from 514,000.
Programme controller Adam Bridge said: "All the changes we have made in the last 12 months have shown that our position with the Birmingham audience is stronger and stronger.
"Not only is the breakfast show the number one in the area but both mid-mornings and evening drivetime have shown significant gains.
"The shift in music we made last year away from manufactured pop to a more consistent focus on guitar-based music is paying dividends."
BBC WM (Birmingham and Black Country) saw its reach rise to 324,000 from 316,000.
Keith Beech, managing editor said: "This is a good weekly growth."
Saga 105.7fm saw its reach drop to 390,000 from 394,000.