When KSXY began broadcasting operations, the station was at 95.9 MHz and was billed as SEXY 95.9 airing a Top 40 mainstream format.

On August 23, 2007, KSXY changed formats once more to rhythmic pop-leaning adult Top 40 and began billing the station as "Y 98.7", with emphasis on 80s, 90s and current music.

This format change coincides with the transfer of the station license to Commonwealth Communications, which has been co-owner of the Sinclair Santa Rosa Cluster.

[5] On June 26, 2023, KSXY dropped the alternative format and branding and launched Spanish CHR "Latino 100.9".

It first originally had simulcasted with KRSH 95.9 FM, but in 2011, it flipped to comedy branded as Funny 95.5.