WDBM, East Lansing, Michigan, United States, branded Impact 89FM, is a 2,000 watt, Class A, student-run college radio station at Michigan State University that broadcasts to listeners in the Lansing metropolitan area. The signal can be heard as far south as Jackson, Michigan, southeast almost to Brighton, and north to Alma, far beyond its 60 dBu service contour which represents its clearest signal. The station is the successor to the Michigan State Network, which in the 1970s was the nation's largest college carrier current radio network, and had studios in several MSU dormitories. The network was eventually consolidated to one carrier current station, WLFT, which broadcast from the former WKAR studios on the third floor of the MSU Auditorium Building. This was also the first home of WDBM-FM.