During the late 80's and through the 1990's when WWPR's tower was on the Pier in Bradenton on the Manatee River and they broadcast the fully allowed 1,000 watts, they were like a local station in Saint Petersburg, even a night in most locations in Saint Petersburg, there was no or little interference to be heard even at night. In fact when they were an oldies stations, they had several Saint Petersburg advertisers, on was a bakery in Saint Petersburg that seemed to be the sole sponsor during certain dayparts.
With their tower move and reduction in power, they still have an adequate signal in SP during the day, but at night, depending on the location in SP, the night-time graveyard frequency interference can be a problem in inland areas and the northern areas of Saint Petersburg, in zip codes 33712 and 33715 good signal day and night, 33701, 33704 and 33705 depends on proximity to the bay for good night-time reception.