Maybe PIO1980 can correct me if I'm wrong, but here goes my understanding.
Marconi used Nicoli Tesla's circuitry to patent the crystal radio. Tesla was convinced that he could transmit high voltage DC electric potential just like (and along with) radio waves.
Tesla's goal was to electrify the entire world for free, or at least in manner that the electricity couldn't be meter with a direct charge to the the consumer.
Perhaps this is conspiracy theory nonsense, but I've heard that Westinghouse suppressed Tesla's research.
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