What is the basic radio principle?

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In Radio
The basic radio principle is:

-- Electromagnetic waves at a desired wavelength can be generated and radiated,
easily, cheaply, and continuously.

-- Information can be added to the electromagnetic waves, easily and cheaply.

-- The electromagnetic waves can be detected, reliably, easily, and cheaply,
at a useful distance from the place where they were generated

-- The waves can be easily and cheaply separated from all other electromagnetic
waves that have different wavelengths.

-- The information impressed on the waves can be reliably, easily, and cheaply recovered.
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