The station's call sign was changed to WLTD on November 2, 1970.[2] WLTD aired easy listening music, old-time radio shows, and specialty talk shows.[17] On May 2, 1970, Chuck Schaden's first Those Were The Days program aired on WNMP.[18][19] It continued on WLTD until 1975, when the station changed format.[19]
In 1975, the station was sold to Kovas Communications for $400,000, and adopted a beautiful music format.[20][2][21][22]
WONX
On April 9, 1979, the station's call sign was changed to WONX.[2] The station switched to a Spanish language format.[23][24] Programming in other languages were also aired over the years.[25][26][27][28] In 1982, the station added nighttime operations, running 2,500 watts.[2][29] It used a four-tower directional array at night.[6] In 1997, the station's daytime power was increased to 3,500 watts.[30]
WCGO
On April 10, 2009, the previous WCGO on 1600, also owned by Kovas, was taken off the air.[31] On April 13, 2009, WONX's call sign was changed to WCGO.[3] With 1600 now vacant, the new WCGO was able to increase its daytime power to 7,000 watts.[32] In 2014, the station's daytime power was increased to 10,000 watts.[33][34]
WCGO began airing talk programs in September 2014, with local shows hosted by Franklin Raff and Geoff Pinkus, as well as Dana Loesch's syndicated program.[35] On April 6, 2015, Milt Rosenberg began hosting a program on the station.[36] As of 2023, its programming is multilingual: Weekend programming includes Legal Eagles with William Pelarenos, The Dave Ramsey Show, The Assyrian Cultural Foundation: The Guiding Voice with Ninos Nirari, The Chicago Wine Report with Chip Dudley, Tom Hall, and Lainie Petersen, Domingo Felices with Frank Camacho, and Dialogo Politico with Robert Ameneiro. Weekdays features Korean Christian programming weekday mornings, Russian language programing via Radio NVC weekday afternoons, and Multiformat Network show highlights in the evenings. Overnight programming is Coast to Coast AM with George Noory.[37]
In 2017, the station was sold to William Pollack for $3 million.[5][38] In 2019, WCGO became the flagship station of the national SmartTalk Radio Network.
Pollack sold WCGO to Jorge Rodriguez's Ambiente Clasico LLC for $675,000 in 2023; Ambiente Clasico had been leasing the station's overnight programming. WCGO's real estate was separately sold to Rodriguez in a $150,000 deal.[39]
^"AM Histories", Broadcasting — Telecasting. A Continuing Study of Major Radio Markets: Study No. 7: Chicago. October 25, 1948. p. 20. Retrieved March 22, 2019.