From the Annals of Broadcast Radio –  In 1922, WBAP-AM began broadcasting in North Texas.^] The station shared time with Dallas stations WFAA and WRR. It was the first station in the U.S. to have an sound logo signal similar to the NBC chimes –  the WBAP cowbell.   WBAP had a rather unique dual frequency sharing arrangement with other stations until 1970, when it paid WFAA for the exclusive rights to 820 AM band.  WBAP began broadcasting country music and was for a time the broadcast home of the Texas Rangers.  The station changed to a news/talk format in 1993 and now features a full line-up of insipid right wing talk radio.  WBAP’s broadcasts can be heard in 114 counties in the day and has been heard in up to 38 states at night.