In 1981, the format was changed to adult contemporary and the branding to WSFM-99, then Sunny 99-FM. On June 29, 1987, it switched back to CHR, branded as 99 HIT-FM with the WHIT call sign. In 1988, Barnstable Broadcasting purchased the station. The call sign was changed to WIMX, the branding to Mix 99.3 and the format changed several times over the years before settling on a mix of "Hot Talk" (WFAN-AM's Imus in the Morning, WJFK-FM's Don and Mike afternoons) and "Hot Music" (rhythmic CHR).
In 1995, the station's owner, Gemini Broadcasting, was on the verge of bankruptcy and sold the station (along with WCMB) to Barnstable Broadcasting. Following the sale, Barnstable changed the station's call letters to WYMJ in March 1995, in anticipation of a format change. On June 30, 1995, the station's format and call sign swapped with sister station KOOL 94.9, moving KOOL's oldies format to 99.3, rebranded as KOOL 99.3 (WYMJ became "Magic 94.9", a hot AC format which did not gain traction in the market and changed formats within months to WRBT). Dame Media bought the station in 1997, the Dame Media stations were bought by Clear Channel Communications in 1999.[2]
On July 1, 2001, Clear Channel rebranded the station as KISS-FM, changed the call sign to WHKF and changed the format back to CHR. Prior to launching, Clear Channel began stunting by playing a continuous sound effect of a small, noisy crowd. As the station's launch drew closer, the voiceover began announcing "Tomorrow at noon ... the talking stops". 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.
On April 2, 2018, in response to Cumulus Media moving WWKL to 106.7 FM (thus expanding the station's CHR format to cover Lancaster, York, and Reading), WHKF began redirecting listeners to sister station WLAN-FM. On April 4, at 11am, after playing "Never Be the Same" by Camila Cabello, the station flipped to alternative rock as Alt 99.3. This move removed redundancy with WLAN-FM, and also provided a competitor to Cumulus's WQXA-FM. The first song on "Alt" was "This is War" by Thirty Seconds to Mars.[3]
