An interesting concept is shown as the “Schematic of multi-looped Magenn Wind Rotors” on
http://www.energykitesystems.net/0/Magenn/, attachment below:
“1. How might the generator be groundstationed? Magnus-effect autorotating tethered non-powered aircraft (kite wings) on a loop scheme with generator on the ground? Not laddermill, just loop being driven by the rotation of the lifting wings. Notice the wings stay aloft and that the winged sector can be in and stay in very high altitude. Severe lifter kite or kytoon could assure tension and staying capacity. Drawing by Harry Valentine. [ED: Magenn Power, what do you think about leaving the generator on the ground?]”