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http://www.windows.umich.edu/spaceweather/wave_modulation.html Radio waves travel at 186,000 miles per second through air compared to sound waves which travel at only 1/5 of a mile per second.
http://www.arches.uga.edu/~klopfens/broadcastfuture.html Understanding the future of broadcasting gives examples from history.
http://www.adec.edu/tag/spectrum.html Radio frequency bandwidth from the Allocated Radio Spectrum is located between 9 KHz and 300 GHz Bandwidth.
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