If you were the owner of a radio a hundred years ago, here’s an idea of what you would have been able to tune in, as listed in the Washington Evening Star, July 4, 1922.
Being the Fourth of July, it’s not surprising that most of the commercial stations have listings for patriotic readings and music. Of course, unless you were close to one of the cities with a station, it might have sounded a bit cacophonous, since all commercial stations at that time were on 360 meters (833 kHz). Naval station NAA in Arlington, Virginia, would have been in the clear, with its transmissions on either 2650 or 2950 meters (113 or 102 kHz).
The commercial stations listed are WGI Boston, KDKA Pittsburgh, KYW Chicago, WJZ Newark, and WJH Washington.