WHAS (840 AM) is a radio station owned by iHeartMedia, Inc. and licensed to Louisville, Kentucky. Its studios are located in the Louisville enclave of Watterson Park, and the transmitter site is in Long Run, in far east Jefferson County. First licensed in July 1922, it is the oldest radio station in Kentucky. Since September 2007 WHAS has also broadcast full-time using the HD Radio IBOC digital radio system, following an initial testing period which started in 2006. HD Radio has since been turned off. Prior to 1995, WHAS broadcast in C-QUAM AM stereo.