Radio communication systems use electromagnetic waves to transmit information over a distance. A transmitter modulates an information signal onto a carrier wave, which is then broadcast through an antenna. A receiver captures the radio waves with an antenna, demodulates the carrier wave to extract the original information signal, and presents it to the user (e.g., as audio or data). Radio is widely used for broadcasting, two-way communication (e.g., walkie-talkies, cellular phones), navigation (e.g., GPS), and remote control.
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