Gregg said:
Not quite in response to the original question, but KYW must be the champ for call letters moving to different frequencies AND cities.
KYW started out in Chicago, moved to Cleveland and then to Philadelphia. Each time it was on a different frequency. I think in Chicago it was on several different frequencies as the FCC reorganized the AM dial several times in those early days of broadcasting.
Its history is:
1921: 833 - Chicago
1922: 833/619 - Chicago
1923: 870 - Chicago
1924: 1020 (Briefly) - Chicago
1924: 560 - Chicago
1927: 570 - Chicago
1928: 1020 - Chicago
1932: 1020 - Philadelphia
1941: 1060 - Philadelphia
1956: 1100 - Cleveland
1965: 1060 - Philadelphia (current)
If this isn't the record for both frequency and COL swaps, I don't know what is.
And it's especially odd since K call letters are so rare east of the Mississippi.
Not when it was licensed in 1921. The Feds couldn't seem to make up their minds as to what callsigns they wanted to assign to broadcasters at that time.