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.
On March 29, 1941, WMBD moved from 1440 kHz to 1470 kHz, a change that has stuck, as part of the agreement for broadcasting in North America that was established at that time.