WDSM (710 AM) is a talkradio station in Duluth, Minnesota, (licensed to Superior, Wisconsin). WDSM was created in 1938 as an affiliate of the Mutual Broadcasting System. The requested call letters were W Duluth Superior Mutual. WDSM provided Mutual programming throughout the Iron Range of Norther Minnesota as well as the Duluth-Superior market. WDSM switched network affiliations with NBC powerhouse WEBC in 1955. This was a direct result of WDSM's commitment to television and its founding of WDSM Channel 6 on March 1, 1954 as a NBC affiliate. WDSM stayed with NBC Radio until the early 1990s. The station aired a country format during the 1980s, and then sports radio during the 1990s.