Amateur Radio is more than 100 years old. At one time, hams were virtually the only people in the world exposed to RF signals. As time progressed and radio communications technology has been developed and proven -- largely by radio amateurs -- its use was made available to the masses and the number of RF signals in the air greatly increased. This has reached a zenith today, with a majority of people walking around with RF transmitters in the form of cellular telephones.
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