Global Wireless SystemTechnology
The energy of Tesla's steam driven Westinghouse 200 kW alternator was to be channeled into an extensive underground radial structure of iron pipe installed 120 feet beneath the tower's base.
This was to be accomplished by superposing a low frequency baseband signal on the higher frequency signal coursing through the transmitter's helical resonator.
The low frequency current in the presence of an enveloping corona-induced plasma of free charge carriers would have "pumped" the earth's charge.
It is believed the resulting ground current and its associated wave complex would have allowed the propagation of wireless transmissions to any distance on the earth's surface with as little as 5% loss due to radiation.