Not to mention the fringes of the Birmingham DMA were also their own markets...the western side was Tuscaloosa, and the other side was Anniston. 33 was the CBS affiliate for Tuscaloosa, and 40 was the CBS for Anniston. This was another factor in WBMG's doormat status as their own signal sucked in the Birmingham area at the time, and the fringes could watch these stations more reliably on their side of town.
Well before WBRC got Fox, WDBB put on a 9pm newscast in the 80s, and was the ORIGINAL Fox affiliate for the Birmingham area, while being a Tuscaloosa station. They later signed on WNAL in Gadsden as a satellite (now WPXH), which almost became the eastern half of Albritton's operation. Neither station penetrated Birmingham well, so it eventually went to Birmingham-based WTTO, who bought WDBB, moved the license to Bessemer, and made it a satellite of WTTO, as well as relaying on WNAL.