In May 1940, the Federal Communications Commission (FCC) announced the establishment, effective January 1, 1941, of an FM radio band operating on 40 channels spanning 42–50 MHz.
[10] To meet the new requirement, in 1946 arrangements were made to sell the smaller station, WEOA, with WGBF and WMLL both remaining under Evansville On the Air ownership.
WMLL instead decided to shut down its 44.5 MHz transmitter and broadcast solely on its new assignment, while implementing a widespread program of converting local receivers to operate on the new band.
This involved installing converters on existing receivers, and the station began a conversion program at a total cost of less than $10 per set.
[17][18] Many FM stations faced major financial challenges in the 1950s, and WMLL turned in its license and was deleted on June 13, 1956.