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WTTO, virtual channel 21 ( UHF digital channel 28), is a CW- affiliated television station serving Birmingham, Alabama, United States that is licensed to the suburb of Homewood. The station is owned by the Sinclair Broadcast Group, as part of a de facto legal triopoly with ABC affiliate WBMA-LD (channel 58) and MyNetworkTV affiliate WABM (channel 68). WTTO and WABM share studio facilities located on Beacon Parkway West in southeastern Birmingham; WTTO maintains transmitter facilities located atop Red Mountain, near the Goldencrest neighborhood of southwestern Birmingham.

WTTO operates a full-time satellite station, WDBB (virtual channel 17; UHF digital channel 18), licensed to Bessemer, another Birmingham suburb. It is Cunningham Broadcasting and operated by Sinclair under a time brokerage agreement. However, Sinclair effectively owns WDBB due to Cunningham's ownership structure. WDBB – which maintains transmitter facilities located east of State Route 69, near Windham Springs – relays WTTO's programming to areas of west-central Alabama that receive marginal to non-existent over-the-air coverage from the latter station's main signal (including its primary city of service, Tuscaloosa). However, there is a decent degree of signal overlap between the coverage areas of WTTO and WDBB's signals in western portions of the Birmingham metropolitan area. On-air references to WDBB are limited to FCC-mandated hourly station identifications during station promotions and regular programming, with both stations using WTTO's virtual channel number in on-air branding.

The main WTTO signal is distributed to cable providers throughout most of the Birmingham–Tuscaloosa– Anniston market from Jefferson, Tuscaloosa and Shelby northeastward, while its programming is available to providers southwest of that line via WDBB. In Birmingham, the station is available on Comcast Xfinity channel 4, Bright House Networks channel 9 and AT&T U-verse channel 21.