????had been operated by amateurs.|Although Herrold hardly ever claimed the invention of radio alone, he did declare the invention of broadcasting to a broad audience, in the use of antennas created to radiate signals in all directions.|Radio broadcasting (experimentally from 1906, commercially from 1920); audio alerts sent from the air as radio wa

????have been operated by amateurs.|While Herrold never claimed the creation of radio itself, he did declare the invention of broadcasting to a broad audience, with the usage of antennas made to radiate alerts in all directions.|Radio broadcasting (experimentally from 1906, commercially from 1920); audio alerts despatched from the air as radio wave