Keep in mind that several DFW FM's are now broadcasting from towers in Wise, Cooke and Grayson counties. WBAP FM (96.7) (licensed to Flower Mound) is on the Wise/Cooke county line near Rosston. It's 90,000 watts from a 2,000 ft. tower BUT it's 65 miles North of Cedar Hill. Several are on the same tower.
These are the result of deregulation allowing small stations in outlying areas to upgrade so they can claim DFW.