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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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# DnBHeaven Radio - Now Playing: Illuminati - The Bomb www.dnbheaven.com
dnbheaven (dnbheaven) Mon, 21 Dec 2009 02:28:01 -0000
# DnBHeaven Radio - Now Playing: Illuminati - The Bomb www.dnbheaven.com
I'm sick and tired of hearing these wack ass rappers puttin this bullshit out on the radio and people love it
AvilleIsLTL (A-ville) Mon, 21 Dec 2009 02:27:57 -0000
I'm sick and tired of hearing these wack ass rappers puttin this bullshit out on the radio and people love it
jajaja si recuerdo este audio narrado. Creo que lo pasaron en la radio e... (YouTube http://bit.ly/61MFXf)
Arrowdance (Luis Cardenas) Mon, 21 Dec 2009 02:27:57 -0000
jajaja si recuerdo este audio narrado. Creo que lo pasaron en la radio e... (YouTube http://bit.ly/61MFXf)
RT @Angelique79: Gonna represent for the Mary Jane models.. Going live on wed.. At crazy mob radio.. Tune in ya heard!!!
myame_nyc (MYAME) Mon, 21 Dec 2009 02:27:56 -0000
RT @Angelique79: Gonna represent for the Mary Jane models.. Going live on wed.. At crazy mob radio.. Tune in ya heard!!!
@vixxenkc 12/21/09 on AllHipHop Radio 9a-1p est DJ Carl Blaze Tribute all WEEK! want 2b in studio or call in 2 pay respect let me know
will2bee (will2bee) Mon, 21 Dec 2009 02:23:48 -0000
@vixxenkc 12/21/09 on AllHipHop Radio 9a-1p est DJ Carl Blaze Tribute all WEEK! want 2b in studio or call in 2 pay respect let me know
So many wonderful promotions 4 sale Q1 2010. If you haven't tried Radio Disney to drive families to your business... DM me to meet & discuss
AmyGarelick (Amy Garelick) Mon, 21 Dec 2009 02:17:14 -0000
So many wonderful promotions 4 sale Q1 2010. If you haven't tried Radio Disney to drive families to your business... DM me to meet & discuss

 

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Americans for Radio Diversity - Home of ARD: activists and supporters of community-based and micropower radio. Actively petitions the FCC to make changes; the latest radio news, email announcement list and discussion board

Alternative Radio - A weekly one-hour public affairs radio program that provides analyses and views that are ignored or distorted in most media.
Meta Description: [ Alternative Radio: Troubled Times. Sound Answers ]

Common Ground Radio - Common Ground--Radio's Weekly Program on World Affairs. Documentaries about a wide variety of subjects
Meta Description: [ Common Ground is a weekly radio program on world affairs produced by the Stanley Foundation since 1980. ]

Flashpoints Radio - (Produced at KPFA, Berkeley) Hard-hitting daily investigative news magazine. Site includes audio archive of recent shows.

LUVeR Alternative News - RealAudio newscast covering social, cultural, political, and personal [r]evolution that the corporate media actively supresses.

National Radio Project - Non-profit organization committed to investigative journalism, analysis, civic participation. Produces Making Contact radio program available online. Also attempting yo develop national alternative distribution system for radio.
Meta Description: [ National Radio Project is an independent, non profit media organization that produces Making Contact, a public affairs radio program covering a variety of social justice, political and environmental issues. National Radio Project trains emerging journalists, heightens public consciousness, broade... ]

500 Partytown - MP3 streaming online broadcasts with music, comedy, and news and resources about grassroots media activism.

Radio Free Europe/Radio Liberty - Radio Free Europe / Radio Liberty is an international news and broadcast organization providing alternative points of view, serving Central and Eastern Europe, the Caucasus and Central Asia.

Save Pacifica - News and information from organization opposed to current policies and actions of Pacifica Radio foundation board.
Meta Description: [ SavePacifica - Restoring Pacifica as a democratic voice of the people! Committed to governance by the community, for the community! Rehire Nicole Sawaya! Bring back Larry Bensky! End the gag rule! ]

Steel on Steel - News, commentary, interview, and debate. An alternative web radio information source for politics, religion and global events. With Host John Loeffler.
Meta Description: [ Steel On Steel provides and alternative media forum for the discussion of news, politics religion and current events. ]