105.1 was originally the frequency for KKJO, now at the frequency of 105.5. KFME ("e105"), with its '80s hits/Hot AC-hybrid format, debuted on June 18, 2001, with "You Get What You Give" by the New Radicals. The station was re-licensed to Garden City, Missouri (south of Kansas City). The station had modest results. After Susquehanna assumed ownership, Jack FM was introduced on October 7, 2004, at Noon. e105's final song was "Don't Speak" by No Doubt, while Jack FM's first song was "Dancing Queen" by ABBA. Jack FM initially debuted with considerable success. Like other Jack stations, KCJK is nearly jockless and sticks to a computerized playlist, highlighted by segments that include the “No-Request Lunch Hour” and liners chastising drivers who slow down to see accidents in the opposite set of freeway lanes.
KCJK and Susquehanna's properties were acquired by Cumulus Media in May 2006. Upon taking over the station, Cumulus added live disc jockeys, a rare move for an adult hits outlet.