 Back during the early 1980s, the WRCK calls belonged to ABC Radio Networks owned-and-operated WRCK-FM 95 (dial position 94.7) in Chicago.In 1980, the station changed its calls to WLS-FM to join with its sister AM station, WLS-AM, while the WRCK calls went to 107.3 FM.On December 15, 2010, WRCK swapped frequencies with WKVU, with WRCK (and its Air 1 affiliation) moving to 100.7 FM and WKVU moving to 107.3 FM.