Tethers, as in large towers many miles high? Maybe thick wires suspended by helium ballons? What about platforms that use the energy in the ionosphere to power themselves and then beam additional energy down to ground-based receivers?
Tethers, as in large towers many miles high? Maybe thick wires suspended by helium ballons? What about platforms that use the energy in the ionosphere to power themselves and then beam additional energy down to ground-based receivers?
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