Radio. It’s an interesting medium. From Edison to Marconi it has been with us since the late 1800’s. Among the first wireless, commercial transmissions were referred to as Marconi-grams.
Marconigram Mar*co“ni*gram, n. [Marconi + –gram.] same as {radiogram}; a wireless message. [Webster 1913 Suppl.]
Transmitting messages wirelessly became preferable over wired transmissions referred to as the telegraph. In 1920 our world changed as KDKA, a government radio station was thrust upon the airwaves and commercial radio kicked off. The BBC in England followed suit around 1922.