Electromagnetic energy, Radio Waves are energy, if there is enough field strength it can be coupled and used as energy. Many years ago at Monash University we powered up a 1000 watt Magnetron to some WG9a waveguide and received the energy via a 1.5 meter parabolic dish with hyperboloidial reflector and popped popcorn 30 meters away from the transmitter.
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Electricity should be free., page-9
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