Marconi sent and detected radio waves.
Today we use microwave ovens.
Measuring magnetic and electrical potentials is 200 year old technology. There is electromagnetic energy but to collect that much would require a huge collector or a strong electromagnetic field.
Drive down the road at 15, 25, 35 Knots, with you hand out the window.
Then google windmills and find out how big a wind is needed to get 21kw output.
A 21kw generator-set using a 1.6L engine will burn 4 gallons of propane/hr. One tank per hour.
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