On December 11, 1921, radio history was made when the signal from amateur station 1BCG in Greenwich, Connecticut, was heard in Ardrossan, Scotland, marking the first successful transatlantic radio transmission using shortwave frequencies. Between 1921 and 1924, radio amateurs experimented with transmitting across the Atlantic. Sponsored by ARRL, these Transatlantic Tests aimed to prove that sho…
Click here for original story, Transatlantic Tests Mark 99th Anniversary
Source: ARRL