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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

@courtneyyhudson - we definitely need to meet him. it's a given - we should phone up/email every radio station and like beg hahha
LeBieberCrew (JO.) Wed, 23 Dec 2009 12:12:03 -0000
@courtneyyhudson - we definitely need to meet him. it's a given - we should phone up/email every radio station and like beg hahha
En ce moment : Kevin Yost - Outa Space sur Radio Tunisie24 Zen http://bit.ly/8WgPCY
Tunisie24 (Tunisie24) Wed, 23 Dec 2009 12:12:02 -0000
En ce moment : Kevin Yost - Outa Space sur Radio Tunisie24 Zen http://bit.ly/8WgPCY
# DnBHeaven Radio - Now Playing: Recriminate - First Encounter www.dnbheaven.com
dnbheaven (dnbheaven) Wed, 23 Dec 2009 12:11:52 -0000
# DnBHeaven Radio - Now Playing: Recriminate - First Encounter www.dnbheaven.com
Update: 5-0 Radio: Police scanner (utilities) - http://tinyurl.com/yg9cje3
iappleous (Jasmine Morgan) Wed, 23 Dec 2009 12:11:38 -0000
Update: 5-0 Radio: Police scanner (utilities) - http://tinyurl.com/yg9cje3
RT @Paiigeyx: Michael jackson on the radio BILLIE JEAN memories live on :)<3
doit4MJ (Catherine Gross) Wed, 23 Dec 2009 12:11:36 -0000
RT @Paiigeyx: Michael jackson on the radio BILLIE JEAN memories live on :)<3
New post: Radio Monte Carlo 6325 Khz (http://cli.gs/yHDdd) http://cli.gs/yHDdd
frfreak (Achim Brueckner) Wed, 23 Dec 2009 12:11:36 -0000
New post: Radio Monte Carlo 6325 Khz (http://cli.gs/yHDdd) http://cli.gs/yHDdd

 

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A Reggae Tune - Official site for the reggae radio show in the Netherlands. Broadcast on 106.0 FM or 88.5 cable in Holland, Friday evenings from 19.00 to 21.00 CET.
Meta Description: [ Official home of the dutch reggae-radioprogram A Reggae Tune (c), which brings you reggae, dancehall, roots & culture, dub and more every friday evening. This site gives you program info, links and news ! ]

About.com: Ska/Reggae GuideSite - More than 20 links to reggae and ska internet radio stations.
Meta Description: [ Expand your horizons and look beyond the pop charts. Explore the whole world of music that is out there: from Celtic and Calypso to Raga and Reggae. Broaden your world view and check out some world music! ]

BlackArk.com - Streaming classic reggae music with a weekly changing playlist. Streaming MP3 format.
Meta Description: [ Lee Scratch Perry and the Upsetters classic reggae vinyl collectors community ]

Junior Dub's Irie Reggae Music - A long-running online radio show with music selected by Junior Dub and annoucing by Jack Slater. MP3 stream-capable player required for online listening.

500 Reggae Club - Radio Malta's weekly reggae show presented by Manwel Tabone. With playlists, online stream, and related links.
Meta Description: [ The Reggae Club show on Radio Malta presented by Manwel Tabone ]

Reggae DJ/VJ Doug Wendt, - information about Reggae CD releases, upcoming Midnight Dread Dread shows links to other Reggae websites. The Midnight Dread has a sydnicated radio show and has been spinning reggae since 1974

500 Reggae Riddims Radio - Jamaican reggae music with continuous streams of jungle, dancehall and reggae music.
Meta Description: [ Reggae Riddims : Jamaican Reggae Music Radio with dancehall, jungle ]

Scratch - A dub, reggae, rocksteady and ska MP3 stream available in both low and high bandwidth speed.

The Uprising - Internet broadcast of the latest and greatest in Jamaica's reggae, roots and conscious dancehall music.

Trojan Radio - Playing music from the classic reggae label Trojan Records. RealPlayer required to listen.
Meta Description: [ NetNames offers affordable domain name registration and corporate packages in over 200 countries. ]