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2. Radio - Wikipedia

   en.wikipedia.org/wiki/Radio

   Radio. An antenna farm hosting various radio antennas on Sandia Peak near Albuquerque, New Mexico, United States. Radio is the technology of communicating using radio waves. [1][2][3] Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter ...

3. Radio in the United States - Wikipedia

   en.wikipedia.org/wiki/Radio_in_the_United_States

   Radio broadcasting has been used in the United States since the early 1920s to distribute news and entertainment to a national audience. In 1923, 1 percent of U.S. households owned at least one radio receiver, while a majority did by 1931 and 75 percent did by 1937. [1][2] It was the first electronic "mass medium" technology, and its ...

4. Radio broadcasting - Wikipedia

   en.wikipedia.org/wiki/Radio_broadcasting

   Radio broadcasting. Broadcasting tower in Trondheim, Norway. Radio broadcasting is the broadcasting of audio (sound), sometimes with related metadata, by radio waves to radio receivers belonging to a public audience. In terrestrial radio broadcasting the radio waves are broadcast by a land-based radio station, while in satellite radio the radio ...

5. History of radio - Wikipedia

   en.wikipedia.org/wiki/History_of_radio

   History of radio. The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of ...

6. List of radio stations in Ohio - Wikipedia

   en.wikipedia.org/wiki/List_of_radio_stations_in_Ohio

   Call sign Frequency Band City of license [1] [2] Licensee Format [3]; WABQ: 1460: AM: Painesville: Radio Advantage One, LLC. Gospel music: WAGX: 101.3: FM: Manchester ...

7. Timeline of radio - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_radio

   Audio broadcasting (1915 to 1950s) 1919: First clear transmission of human speech, (on 9XM) after experiments with voice (1918) and music (1917). 1920: Regular wireless broadcasts for entertainment began in Argentina, pioneered by the group around Enrique Telémaco Susini. 1920: Spark-gap telegraphy stopped.