WGN
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WGN is the callsign of two broadcast stations in Chicago, Illinois, both of them owned by the Tribune company.
- radio station WGN AM 720
- TV station WGN-TV 9 (DTV 19)
WGN is also a U.S. network available on satellite and cable TV services known as Superstation WGN.
In addition, the former WGN-FM 98.7 is now WFMT.
The Chicago Tribune called itself The World's Greatest Newspaper. It is from that slogan that the call letters were derived, when the radio station was started in the 1920s. In the newspaper's radio program listings, for many years, it was spelled W-G-N to make it visually stand out from the other Chicago stations listed.
WGN also means White Gaussian noise (see also Additive white Gaussian noise (AWGN))