Have you ever wondered how your radio works?
In the air right now there are many type of waves. Radios take these electromagnetic waves and convert them into sound, They do this by using a receiver and an antenna. The antenna pick up on the waves frequency and sends them to the receiver (tuner, detector & amplifier) which then turns them into the sound that you hear.
http://electronics.howstuffworks.com/radio8.htm
http://en.wikipedia.org/wiki/Radios
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