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This article is about radio broadcasting.

"On air" redirects here. For the album by Alan Parsons, see On Air. For the Italian airline, see On Air (airline).

Radio broadcasting is an audio (sound) broadcasting service, broadcast through the air as radio waves (a form of electromagnetic radiation) from a transmitter to a receiving antenna.

Stations can be linked in radio networks to broadcast common programming, either in syndication or simulcast or both.

Audio broadcasting also can be done via cable FM, local wire networks, satellite and the Internet.

The earliest radio stations were simply radioteleくりっく365graphy systems and did not carry audio.

The first claimed audio transmission that could be termed a broadcast occurred on Christmas Eve in 1906, and was made by Reginald Fessenden.

Whether this broadcast aグルコサミンctually took place is disputed.

While many early experimenters attempted to create systems similar to radiotelephone devices where only two parties were meant to communicate, there were others who intended to transmit to larger audiences.

For the next decade, radio tinkerers had to build their own radio receivers.

n The Hague, the Netherlands, PCGG started broadcasting on November 6, 1919.

KDKA of Pittsburgh, under Westinghライスフォースouse's ownership, started broadcasting as the first licensed "commercial" radio station on November 2, 1920.

The commercial designation came from the typFX 比較e of license; advertisements did not air until years later.

The first broadcast in USA was the results of the U.S. presidential election, 1920.

Radio Argentina began regularly scheduled transmissions from the Teatro Coliseo in Buenos Aires on August 27, 1920, making its own priority claim.

When Internet-based radio became feasible in the mid-1990s, the new medium required no licensing and stations could broadcast from anywhere in the world without the need for over the air transmitters.

This greatly reduced the overhead fレーシックor establishing a station, and in 1996, George Maat started 'A' Net Station (A.N.E.T.) under the now defunct domain Advice-Net.com, and began broadcasting commercial-free from Antarctica.

WMBR, the MIT student radio station, developed the "MIT List of Radio Stations" in the mid 1990's.

This was one of several lists of radio station websites in the early days of the World Wide Web.

Radio-Locator lists all U.S. "terrestrial" radio stations that may not have a live audio stream, or even a website, on the Internet.