WSUM 91.7 FM Madison | 545 followers on LinkedIn. WSUM is the student-run freeform radio station at the University of Wisconsin-Madison. With over 200 active members, WSUM is one of the country’s largest college radio stations and serves more than 197,000 listeners per year through 24/7/365 programming on its FM signal and internet radio streams. The station’s mission is to act in a service and outreach capacity to the people of Madison, to provide an educational environment for students of UW-Madison, and to be an alternative source of information and entertainment to our campus and community.