sentences:  In later years, WOYL-FM would develop into a 20,000 watt powerhouse and remains the only such powerful station in all of Venango County, though now under different call letters and ownership.In early 1977 ownership of the stations changed principally to orthodontist Robert J. Shupala, who changed the AM call letters to WOYL and the FM call letters to WRJS, named for Shupala's initials.The stations had been simulcasting, but under the new ownership and management they began separate programming.