The station is owned by Educational Media Foundation, and airs a Christian contemporary format, as an affiliate of K-Love.

[4] Gradually in the 1970s, the station added a progressive program known as "Headquarters" at night beginning at 6:00 p.m. and ending with sign-off at 2:00 a.m.

[12][13] The station became "92 Kiss FM", retaining its CHR format and began simulcasting 92.7 WKIE in Arlington Heights and 92.7 WKIF in Kankakee.

[16][17] On January 12, 2001, Clear Channel's WUBT changed formats from rhythmic oldies to CHR as WKSC-FM "Kiss 103.5".

[18] At that time, Clear Channel filed suit against Big City Radio, alleging the "Kiss FM" branding used by WDEK and its simulcasts violated its national trademark.

[25][26][27][28] In 2004, Spanish Broadcasting System sold WDEK, WKIE, and WKIF to Newsweb Corporation for $28 million.

[29][30] At 9 a.m. November 29, 2004, WDEK and WKIE began simulcasting with its new adult hits sister station 99.9 WRZA in Park Forest, Illinois, as "Nine FM", with the slogan "We Play Anything".

[3] On June 2, 2014, WCPQ and WCPT-FM broke away from the Progressive Talk simulcast and changed their daytime format to Polish language programming as "Polski FM".