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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

Control apparatus for changing a downtilt angle for antennas, in particular for a mobile radio antenna for a base station, as well ...
tweetalot (tweetalot) Fri, 18 Dec 2009 05:20:13 -0000
Control apparatus for changing a downtilt angle for antennas, in particular for a mobile radio antenna for a base station, as well ...
NOW PLAYING: dj ba-back - fuck the poing http://brakeout-radio.kicks-ass.net
brakeoutradio (Vincent) Fri, 18 Dec 2009 05:20:01 -0000
NOW PLAYING: dj ba-back - fuck the poing http://brakeout-radio.kicks-ass.net
OMFREAKENG!!!! All I Want For Christmas Is You <333 <--- radio, right now :D -BOUNCING UP AND DOWN ON MY CHAIR-
FionaYuen17 (Fiona Yuen) Fri, 18 Dec 2009 05:19:55 -0000
OMFREAKENG!!!! All I Want For Christmas Is You <333 <--- radio, right now :D -BOUNCING UP AND DOWN ON MY CHAIR-
@Lizzchu XDD Well, not the radio here. I was listening to Arirang Radio through the internet. If I heard it on the local radio I would cry.
coininbox (Satsuki Thomas) Fri, 18 Dec 2009 05:19:47 -0000
@Lizzchu XDD Well, not the radio here. I was listening to Arirang Radio through the internet. If I heard it on the local radio I would cry.
RT @JumpOffRadio: jump off radio is soo thankful for 2009 to all the hip hop heads int eh filipino communitythat supported and to all th ...
fenfen (FenaxiZ) Fri, 18 Dec 2009 05:19:46 -0000
RT @JumpOffRadio: jump off radio is soo thankful for 2009 to all the hip hop heads int eh filipino communitythat supported and to all th ...
We recommend checking out Sidecar Radio http://www.reverbnation.com/c./poni/7372288
gsoulmusic (Genevieve) Fri, 18 Dec 2009 05:19:46 -0000
We recommend checking out Sidecar Radio http://www.reverbnation.com/c./poni/7372288

 

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Aloha2go RadioShow - Current and archived Hawaiian music show, serving to share real Hawaiian music with the world. RealPlayer required for listening.
Meta Description: [ Aloha2go.com podcast hawaiian music Jam sampler - Sponsored by Hawaii's in Las Vegas toll free 1-877-398-1688 ]

Batanga - Featuring over ten online Windows Media Player streams, from rock and pop to Cubanisimo and Tango. Site available in Spanish and English.

Internet Radio Internationale - Online radio station playing music from all around the world 24 hours a day.
Meta Description: [ Xpand your horizons by listening to real reggae on internet radio internationale. ]

KPHI Radio - Featuring music selections from many cultures and styles, including Celtic, German, Polish, Latin, Islamic, Asian, dance, new age and classical.
Meta Description: [ KPHI Multi-Cultural Radio on the Web ]

Omel Web Radio - Music and spoken word online broadcast, featuring soca, reggae and calypso music, plus speeches.

Pacific Islands Radio - Internet radio stations and an overview of the music of the region.

Radio Nova Chicago - Euro and Romanian dance music. RealPlayer, WinAmp, and Windows Media streams available.
Meta Description: [ Radio Nova Chicago ...JUST MORE DANCE... ]

Sisyphus Tracks - Online broadcast offering thematic programs of eclectic roots, folk, Americana and world music, including independent recording artists. Also with reviews, news and related features, information and services.
Meta Description: [ Internet radio station featuring integrated roots music programming served commercial-free via on-demand and live streams. Genres include Americana music, alternative country, folk music, bluegrass, old-time music, blues, roots rock and world. ]

Tempo Italiano with John Richetta - A syndicated radio program of Italian music via RealAudio and live on the air Sundays from 9:00 AM to 3:00 PM on WEST AM 1400, in Easton, Pennsylvania.
Meta Description: [ Tempo Italiano, one of seven weekly radio programs that are produced by Richetta Promotions, can be heard every Sunday on am1400 WEST in Easton, PA from 9A to 3P. ]

Thendral - Tamil Radio - Internet music, entertainment, news and information pertinent to Tamils living in the USA. Requires Windows Media Player.

404 World Song Shop - Weekly program offering a mix of world beat, acoustic and singer/songwriter selections. From 88.3 FM Syracuse.