WCSF (88.7 FM, "The Edge") is a radio station broadcasting an alternative music format. Licensed to Joliet, Illinois, USA, the station is currently owned by the University of St. Francis. The school was known as the College of St. Francis until 1998 and the broadcast license is still held in that name. WCSF is best known for its annual "Spirit of Christmas" non-stop Christmas music programming from Thanksgiving to New Years which was launched in 1994 by radio personality and station manager Bob Zak.