According to this Rolling Stone news item, Jack radio in Dallas (100.3 FM) did well, then not so well.
The radio chain that has yet to jump on Jack’s bandwagon is the biggest: Clear Channel. “Some stations that have flipped to the format are experiencing early ratings spikes followed by swift declines,” says Sean Compton, Clear Channel’s vice president of radio programming. A recent study by Arbitron and Edison Media Research supports this thesis: Ratings for Jacks in Denver, Dallas and elsewhere spiked, then dipped, and the format rates poorly for time spent listening.
In other news, Mighty 1190 still rocks.