WGN (720 kHz) is a commercial AM radio station in Chicago, Illinois, with studios on the 18th floor of 303 East Wacker Drive in the Chicago Loop. WGN has a news/talk format, along with broadcasts of Chicago Blackhawks hockey and Northwestern University football and basketball. WGN is the only radio station owned by Nexstar Media Group, which primarily owns television stations. From 1924 to 2014, WGN was owned by Tribune Media, which also owned the Chicago Tribune, whose "World's Greatest Newspaper" slogan served as the basis for the WGN call sign.