Holt sold WGPA-AM to Henry Chadwick in 1978 for approximately $400,000. The WGPA-AM offices and studios were moved to the Dodson Building at 528 North New Street. Soon after, the station adopted the moniker "Sunny 1100," playing a mix of adult standards and soft adult contemporary music, with a mix of local news, weather and traffic. Among the more notable WGPA alumni from this period was Bill Zimpfer, who played music, but who also provided play-by-play for Lehigh University football before moving on to sports radio jobs with Penn State University and the Miami Dolphins.