WDBJ-TV first signed on the air on October 3, 1955, originally owned by the Times-World Corporation, publishers of the Roanoke Times and Roanoke World-News, and operators of WDBJ radio (960 AM, now WFIR; and 94.9 FM, now WSLC-FM). Channel 7 has been a CBS affiliate since its sign-on, owing to WDBJ radio's longtime affiliation with the CBS Radio Network. WDBJ-TV was the third television station to sign-on from Roanoke, after NBC affiliate WSLS-TV (channel 10) and WROV-TV (channel 27, frequency later occupied by WFXR), which operated as an independent station from February to July 1953. Before channel 7 signed on, CBS programming had been carried part-time on Lynchburg-based WLVA-TV (channel 13, now WSET-TV). During the late 1950s, WDBJ was also briefly affiliated with the NTA Film Network.