WJQB (ex-WGUL-FM) comes in very poorly within Tampa city limits, particularly in South Tampa, but in the northern suburbs it comes in OK. Back when WGUL 860 AM & FM were simulcasting, I think the station's management used the FM in the northern suburbs to augment the nighttime AM signal, which at night had trouble in the north.
Of course, there are plenty of listeners in WJQB's regular listening area anyway, so I'm sure they're not hurting in that regard anyway.