WDEF-FM is a radio station serving the Chattanooga area, broadcasting on 92.3 FM. The station operates a adult contemporary (AC) format and is branded as "Sunny 92.3 FM". From Thanksgiving to Christmas Day, it broadcasts an all-Christmas music format. The station can be heard throughout southern east Tennessee, northwest Georgia (often down to northwest metro Atlanta, despite co-channel W222AF there), and most of northeast Alabama.
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