On March 29, 1941, WMBD, along with most of the stations on 1440 kHz, moved 1470 kHz, its location ever since, as part of the implementation of the North American Regional Broadcasting Agreement.
WMBD made a change in frequency on March 29, 1941, shifting from 1440 kHz to 1470 kHz, where it has remained ever since, as part of the agreement for regional broadcasting in North America.