The station transmitted on 5.690 MHz from 1924–1929 and 6.060 MHz (June 1929 November 1, 1942). In 1941, operations were described as "the only international station in the United States authorized to operate on each of the six short-wave bands with unlimited frequencies and unlimited time. WLWO's assigned frequencies are: 6.08, 9.59, 11.71, 15.25, 17.80 and 21.65 megs", with programs in English, Spanish and Portuguese. In 1943, Crosley engineers built the U.S. government's Bethany shortwave transmitter site, which was later taken over by the Voice of America.