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First station

  • Date: August 17, 1922-April 4, 1924
  • Frequency:
    • 833 khz (August 17, 1922-May 15, 1923)
    • 670 khz (May 15, 1923-June 30, 1923...)
  • Location:
  • Owner of license:
    • Chicago Radio Laboratory (...September 1, 1922-April 4, 1924)
    • Zenith Radio Corporation (Note that this may not actually represent a change in ownership, as Zenith was a subsidiary of CRL and ultimately took over its properties. Some sources show CRL as being renamed to Zenith on June 30, 1923, others as CRL establishing a marketing subsidiary named Zenith, but CRL is shown as licensee in two lists dated June 30, 1923 [this station] and June 30, 1924 [the second station].)
  • Subsequent call letters: WGN

Second station

  • Date: (...June 30, 1924-June 30, 1925...
  • Frequency:
    • 1120 khz (...June 30, 1924-June 30, 1925...)
  • Location:
  • Owner of license:
    • Chicago Radio Laboratory (...June 30, 1924...)
    • Zenith Radio Corporation (Note that this may not actually represent a change in ownership, as Zenith was a subsidiary of CRL and ultimately took over its properties. Some sources show CRL as being renamed to Zenith on June 30, 1923, others as CRL establishing a marketing subsidiary named Zenith, but CRL is shown as licensee in two lists dated June 30, 1923 [the first station] and June 30, 1924 [this station].)

Note that although the third station had the same ownership as the second, it was not a direct successor. Zenith sold the WJAZ property but retained the right to the call letters.

Third station

  • Date: ...June 30, 1926-June 30, 1928...
  • Frequency:
    • 930 khz (...June 30, 1926...)
    • 1140 khz (...June 30, 1927-June 30, 1928...)
  • Location:
  • Owner of license:
    • Zenith Radio Corporation (...June 30, 1926-November 6, 1931)

Fourth station

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