Radio History

Radio communication — transmitting information through electromagnetic waves — was developed through the work of Heinrich Hertz (demonstrating electromagnetic waves, 1887), Nikola Tesla (first radio transmitter, 1893), and Guglielmo Marconi (first practical wireless telegraphy, 1895; first transatlantic radio transmission, 1901). Marconi received the Nobel Prize in Physics (1909), though Tesla's priority is debated. Radio transformed communication, warfare, entertainment, and culture. AM broadcasting began in the 1920s (KDKA, Pittsburgh, 1920 — first licensed commercial station); FM was developed by Edwin Armstrong (1930s) for higher fidelity. Radio was the first mass electronic media — bringing news, music, drama, and presidential communication directly into homes. FDR's 'Fireside Chats' (1933-44) used radio to reassure Americans during the Depression and WWII. Radio remains the world's most widespread communication medium — with 5 billion listeners globally.