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WGST AM 640 ("Talk 640 WGST") is a radio station licensed in the city of Atlanta, Georgia. WGST is a Class B station operating on the frequency of 640 kHz with 50,000 watts of power during the daytime, and 1,000 watts of power during nighttime hours; a two-tower directional antenna is used, with differing patterns daytime and nighttime based from its transmitter site in West Atlanta. The station broadcasts from studios located at the Peachtree Palisades building in the Brookwood Hills district of Atlanta, and is owned by the subsidiary Citicasters Licenses (formerly part of Jacor Communications), and serves the Atlanta metropolitan area media market with a talk radio format.

The facility at 640 started with an application in 1981, with a construction permit granted by the Federal Communications Commission (FCC) in 1985, and the broadcast callsignWPBD issued in 1986. After a series of extensions to the six-month permits and finally a minor modification, it finally went on the air in February 1988. After an initial dismissal later that year, permission to transfer the station to Jacor was granted in 1989, and the WGST format was moved from what is now WGKA AM 920. The station's nighttime radiation pattern has a null toward the northeast.

An English-language station for the bulk of its history, WGST became an affiliate of ESPN Deportes Radio on September 28, 2012. WGST returned to a talk format on June 3, 2013 with an all- syndicated format broadcasting in English.