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1820, that a magnetic field is created around a wire that has a current running through it.
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In 1830, English physicist Michael Faraday confirmed Oersted's theory and established the principle of electromagnetic induction. -
In 1864, James Clerk Maxwell, an experimental physics professor at Cambridge University, published a theoretical paper stating that electromagnetic currents could be perceived at a distance.
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1880s, German physicist Heinrich Hertz he successfully produced electromagnetic waves and confirmed maxwells prediction -
Not long after, Guglielmo Marconi, an Italian inventor, brought electromagnetic waves out of the laboratory and into the world.
in September 1899, he astounded the world by telegraphing the results of the America's Cup yacht races from a ship at sea to a land-based station in New York. -
By 1901 he founded his own commercial wireless company and broadcasts the own translation signal.
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on December 24, 1906, Canadian-born physicist Reginald Fessenden changed that by sending the first long-distance transmission of human voice and music from his station at Brant Rock, Massachusetts.
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In 1907, American inventor Lee De Forest introduced his patented Audio signal detector--which allowed radio frequency signals to be amplified dramatically.
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The period between the late 1920s and the early 1950s is considered the Golden Age of Radio, in which comedies, dramas, variety shows, game shows, and popular music shows drew millions of listeners across America.
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Another American inventor, Edwin Armstrong, developed the superheterodyne circuit in 1918, and in 1933 discovered how FM broadcasts could be produced.