WGNO was purchased by Glendive Media in 1978, who would in turn sell the station to Tribune Broadcasting in 1983. By coincidence, the station's callsign reflects a connection with Tribune's flagship television station in Chicago, WGN-TV (whose own call letters stand for "World's Greatest Newspaper", in reference to the longtime slogan of the company's founding newspaper, the "Chicago Tribune"); however, channel 26 had the "WGN" lettering in its callsign twelve years before Tribune even bought the station; this connection, coupled with the fact that two other Tribune-owned television stations also incorporated the "WGN" name in their callsigns (Denver's KWGN-TV and Atlanta's WGNX (now WGCL-TV), the former of which remains owned by the company), channel 26 kept the WGNO call letters. Under Tribune, the station continued to grow, and WGNO remained the leading independent station in the market even as other competitors signed on the air—WNOL-TV (channel 38) in March 1984 and later, WCCL (channel 49, now Ion Television owned-and-operated station WPXL-TV) in March 1989. WGNO reportedly turned down an offer by Fox to become a charter affiliate of the network, prior to its October 1986 launch; Fox programming instead went to WNOL, which its then-owners TVX Broadcast Group used as leverage to get Fox to sign a deal to affiliate with the majority of the company's independent stations. The station dropped the "-TV" suffix from the callsign on August 17, 1988.