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Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.

Radio waves

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Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum. In radio, this acceleration is caused by an alternating current in an antenna. Radio frequencies occupy the range from a few tens of hertz to a few hundred gigahertz.

ELF - SLF - ULF/VF - VLF - LF/LW - MW - HF/SW - VHF - UHF - SHF - EHF Electromagnetic radio spectrum

Other types of electromagnetic radiation, with frequencies above the RF range, are infrared, visible light, ultraviolet, X-rays and gamma rays. Since the energy of an individual photon of radio frequency is too low to remove an electron from an atom, radio waves are classified as non-ionizing radiation.
Electromagnetic spectrum and diagram of radio transmission of an audio signal.

Electromagnetic radiation travels (propagates) by means of oscillating electromagnetic fields that pass through the air and the vacuum of space equally well, and does not require a medium of transport (such as the aether). When radio waves pass an electrical conductor, the oscillating electric or magnetic field (depending on the shape of the conductor) induces an alternating current and voltage in the conductor. This can be transformed into audio or other signals that carry information. The word 'radio' is used to describe this phenomenon, and television, radio, radar, and cell phone transmissions are all classed as radio frequency emissions.

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Radio - Twitter Search

Heard this on the radio today: Abba got inducted into the Rock & Roll Hall of Fame, but KISS was passed over? WTF is this world coming to?
levimarc (Marc Levi) Thu, 31 Dec 2009 14:18:22 -0000
Heard this on the radio today: Abba got inducted into the Rock & Roll Hall of Fame, but KISS was passed over? WTF is this world coming to?
@vientohalcon tributos femeninos? ahora me has dejado descolocado, el enlace funciona y es el de Radio Euskadi.. ja, ja....
perem (The Best Music) Thu, 31 Dec 2009 14:18:14 -0000
@vientohalcon tributos femeninos? ahora me has dejado descolocado, el enlace funciona y es el de Radio Euskadi.. ja, ja....
RushLimbaugh.com updates via Thursday's radio program http://bit.ly/5bRKxL
jagbirsinghseo (Jagbir Singh) Thu, 31 Dec 2009 14:18:09 -0000
RushLimbaugh.com updates via Thursday's radio program http://bit.ly/5bRKxL
@all Guten Rutsch und feiert schön ^^ Und morgen/Neujahr 21-22 Uhr Radio 88,0 DJ Enno in da Mix
EnnoHacker (Enrico Harder) Thu, 31 Dec 2009 14:18:09 -0000
@all Guten Rutsch und feiert schön ^^ Und morgen/Neujahr 21-22 Uhr Radio 88,0 DJ Enno in da Mix
RT: @OMGFacts It took radio 38 years to hit 50 million users. The internet took 5 years. #omgfacts
ATL_Mouseketeer (Lisa Sinyard) Thu, 31 Dec 2009 14:18:09 -0000
RT: @OMGFacts It took radio 38 years to hit 50 million users. The internet took 5 years. #omgfacts
Dicen que @1tny salió en la radio... Me pregunto cuál #1tny
martinalejandro (Martín Alejandro) Thu, 31 Dec 2009 14:18:00 -0000
Dicen que @1tny salió en la radio... Me pregunto cuál #1tny

 

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96.1 FM, KINI Radio - FM station on the Rosebud Indian Reservation at St. Francis, South Dakota.

97.3 FM CKON - Mohawk Nation Radio in N.Y. and Canada. Rooseveltown, NY.

AIROS - Homepage to the American Indian Radio on Satellite
Meta Description: [ AIROS, American Indian Radio on Satellite, provides authentic Native American music, news, entertainment, interviews and discussions on current issues to Indian Country and the world. ]

alterNative Voices - Radio show on KUVO FM in Denver, CO, also streamed live online. Includes show information, calendar of events, related community information, and playlists.
Meta Description: [ alter Native Voices plays Native music and provides airplay & interviews Native Musicians. alter Native Voices website lists calendars, events, services, entertainment, scholarship, news, and information in and about the Native American Indian communities ]

First Nations Broadcasting - Native American and Alaskan News and Music via Real Player. Plus other Native and Alaskan links.

KTNN AM 660 - KWRK 96.1 FM - Voice of the Navajo, radio stations in Window Rock, Arizona.

Native Am Radio Stations list - Information page covering ten states with Native American radio frequencies and phone numbers.

Native Radio - Native American artist information and music broadcasts available in RealPlayer, Media Player, or streaming MP3 format.
Meta Description: [ NativeRadio.com is your portal to the beauty and mystery of Native American Music. We are the largest source of Native American music on the Web. NativeRadio also has five Native American radio stations playing Native American music 24 hours a day, 7 days a week ]

Oyate Native American Music - Music clips of Native American pieces that have been performed on Public Radio

The Storyteller - Program features true stories of First Nations people who are following Jesus Christ.
Meta Description: [ The Storyteller Native radio program - Faith, Culture and Real Life from a Unique First Nations perspective. ]