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James Clerk Maxwell showed in theoretical and mathematical form in 1864 that electromagnetic waves could propagate through free space.
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Over several years starting in 1894 the Italian inventor Guglielmo Marconi built the first complete, commercially successful wireless telegraphy system based on airborne Hertzian waves (radio transmission).
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By August 1895 Marconi was field testing his system but even with improvements he was only able to transmit signals up to one-half mile,
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In 1900, Brazilian priest Roberto Landell de Moura transmitted the human voice wirelessly for a distance of approximately a half mile.
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In April 1909 Charles David Herrold, an electronics instructor in San Jose, California constructed a broadcasting station. It used spark gap technology, but modulated the carrier frequency with the human voice, and later music.
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In 1909, Marconi and Karl Ferdinand Braun were awarded the Nobel Prize in Physics for "contributions to the development of wireless telegraphy".
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In 1913, the International Convention for the Safety of Life at Sea was convened and produced a treaty requiring shipboard radio stations to be manned 24 hours a day.
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On March 8, 1916, Harold Power with his radio company American Radio and Research Company (AMRAD), broadcast the first continuous broadcast in the world from Tufts University under the call sign 1XE (it lasted 3 hours).
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The first station to receive a commercial license was WBZ, then in Springfield, Massachusetts . Lists provided to the Boston Globe by the U.S. Department of Commerce showed that WBZ received its commercial license on 15 September 1921; another Westinghouse station, WJZ, then in Newark, New Jersey, received its commercial license on November 7, the same day as KDKA did.[58
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In 1954, the Regency company introduced a pocket transistor radio, the TR-1, powered by a "standard 22.5 V Battery."
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One of the first developments in the early 20th century was that aircraft used commercial AM radio stations for navigation. This continued until the early 1960s when VOR systems became widespread.
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Internet radio was pioneered by Carl Malamud. In 1993, Malamud launched "Internet Talk Radio" which was the "first computer-radio talk show, each week interviewing a computer expert.".
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In 1995, Scott Bourne founded NetRadio.com as the world's first Internet-only radio network.
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In 2003, revenue from online streaming music radio was US$49 million.
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To focus attention on the consequences of the impending rate hike, many US Internet broadcasters participated in a "Day of Silence" on June 26, 2007. On that day, they shut off their audio streams or streamed ambient sound, sometimes interspersed with brief public service announcements voiced, written and produced by popular voiceover artist Dave Solomon.[3
