<P> One year after that experiment, he received his first patent from the Brazilian government . It was described as "equipment for the purpose of phonetic transmissions through space, land and water elements at a distance with or without the use of wires ." Four months later, knowing that his invention had real value, he left Brazil for the United States with the intent of patenting the machine at the US Patent Office in Washington, DC . </P> <P> Having few resources, he had to rely on friends to push his project . Despite great difficulty, three patents were awarded: "The Wave Transmitter" (October 11, 1904), which is the precursor of today's radio transceiver; "The Wireless Telephone" and the "Wireless Telegraph", both dated November 22, 1904 . </P> <P> The next advancement was the vacuum tube detector, invented by Westinghouse engineers . On Christmas Eve 1906, Reginald Fessenden used a synchronous rotary - spark transmitter for the first radio program broadcast, from Ocean Bluff - Brant Rock, Massachusetts . Ships at sea heard a broadcast that included Fessenden playing O Holy Night on the violin and reading a passage from the Bible . This was, for all intents and purposes, the first transmission of what is now known as amplitude modulation or AM radio . </P> <P> In June 1912 Marconi opened the world's first purpose - built radio factory at New Street Works in Chelmsford, England . </P>

Who made the first radio broadcast in the world