The Encyclopedia of American Radio

This information is gathered up to 1960 generally. — Here is just one listing from this publication:
Belcher, Rod. Sportscaster (KGVO, Missoula, MO, 1942; Echoes from the Grandstand, KMO, Tacoma, WA, 1947 -1949; KOL Seattle, WA, 1952 -1955; KING, Seattle, WA, 1960). DJ ( The Jazz Show, KMO, 1947). So, it is somewhat incomplete.
https://worldradiohistory.com/BOOKSHELF-ARH/Regulatory/Business/Encyclopedia-of-American-Radio.pdf
and if you found that to be rather dry, try this Encyclopedia of Radio, which describes the various business aspects of running a radio station and gives descriptions of individual radio programs that ran during the Golden Age of Radio…
https://worldradiohistory.com/BOOKSHELF-ARH/Encyclopedias/Archive-Encyclopedia-of-Radio/Encyclopedia-of-Radio-Complete.pdf