WSIS is a radio station which is part of the Smile FM radio network licensed to Riverside, Michigan. It began operation on November 22, 2008, and was granted a license on January 8, 2009. With a transmitter located just north of Benton Harbor, the station uses the same tower as WCXT. WSIS broadcasts the Smile FM programming. It officially retransmits the signal of WHYT, however, much of the programming comes from flagship station WLGH in Lansing.