In 1978, the station rebranded as Rock 99 with a format change to CHR ("Top 40") and began competing with WKBO and WQXA-FM in York.
Prior to launching, Clear Channel began stunting by playing a continuous sound effect of a small, noisy crowd.
This was thought to be a direct shot at popular afternoon drive talk show host Bruce Bond, of Wink 104, who has since left that station.
[3] On May 28, 2021, at 11 am, after playing "Tongue Tied" by Grouplove, the station began stunting with a loop of "It's the End of the World as We Know It (And I Feel Fine)" by REM.
At Noon, following a single playing of "Good Riddance (Time of Your Life)" by Green Day, the station flipped to urban contemporary as "Real 99.3".