Miami-based Classical South Florida, an affiliate of American Public Media Group, is expanding its service to the state’s western coast with the $4.35 million purchase of WAYJ-FM, a 75,000-watt station that broadcasts to a potential audience of nearly 1 million listeners in Fort Myers and beyond. The purchase, announced Feb. 14, is part of a three-way transaction with seller WAY Media, a religious broadcasting network that’s moving its Christian pop music service and its call letters to 89.5 MHz in Naples, a 100,000-watt station, formerly WSRX-FM. Though the Naples station broadcasts at a higher effective radiated power (ERP), Classical South Florida’s new station has the better signal, with a higher antenna and larger potential audience. It covers a population of 991,520, compared with 340,913, according to Tom Kigin, executive v.p. for Minnesota-based APMG.