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WAMU is a public radio station that services the greater Washington, D.C. metropolitan area. The station broadcasts on 88.5 FM, online at wamu.org, and on HD Radio at 88.5, Channels 1, 2, and 3. WAMU is on-air 24 hours a day. It is licensed to American University, and its studios are located near the campus in northwest Washington, D.C. WAMU’s HD Channel 2 broadcasts WAMU’s Bluegrass Country, which is also available at bluegrasscountry.org and on-air in northern Virginia at 105.5 FM; WAMU-3 broadcasts content from WTMD, an AAA station in Towson, Maryland, as well as other NPR and BBC World Service programming. This change became effective on September 17, 2007