At 07:36 PM 9/9/2008, Fred Gleason, wrote
>IIRC, WMCA New York has been on 570 kHz with the same call letters
>continuously since 1922 or thereabouts.
Feb/Mar 1925. There is some disagreement
with different histories. I'd hoped someone
would have a newspaper citation to show
the first day of broadcast. So far, I've
not see it.