CBS then sold its interest in KTTV (now the West Coast flagship of the Fox network) and purchased outright Los Angeles pioneer station KTSL in 1950, renaming it KNXT (after CBS's existing Los Angeles radio property, KNX), later to become KCBS-TV. In 1953, CBS bought pioneer television station WBKB in Chicago, which had been signed on by former investor Paramount Pictures (and would become a sister company to CBS again decades later) as a commercial station in 1946, and changed that station's call sign to WBBM-TV, moving the CBS affiliation away from WGN-TV.
In 1950, CBS sold KTTV (now the West Coast flagship of the Fox network) and acquired KTSL outright, renaming it KNXT (after CBS's existing Los Angeles radio property, KNX), later becoming KCBS-TV. In 1953, CBS purchased WBKB in Chicago, which had been established by former investor Paramount Pictures as a commercial station in 1946 and changed its call sign to WBBM-TV, moving the CBS affiliation away from WGN-TV.