WWSN (97.5 FM, "Sunny FM") is a radio station broadcasting a Adult Contemporary format. Licensed to Whitehall, Michigan, the station serves the Muskegon, Michigan market. ... See more The station's programming is derived from Cumulus Media Networks' Hits & Favorites format. It Is Heard As Far Grand Rapids, Michigan, East Of US-131, It experiences interference from WJIM-FM From Lansing.