This map, which was published in April of 1957, was part of a coordinated effort on the part of the licensees of clear-channel AM stations around the country to demonstrate their continued relevance, during the first post-war push to eliminate that service. The ``white areas'' shown on the map received no night-time AM radio service. The map is hanging on the wall of Watt's office.
(That effort failed, by the way, and the ultimate dénouement was the assignment of full-time class-II stations to clear-channel frequencies in the West, like 670 in Boise, 720 in Las Vegas, 770 in Albuquerque, and 880 in Lexington.)
Copyright 2002, Garrett A. Wollman. All rights reserved. Photograph taken 2002-02-27.