Could we make something that feeds a low impedance directly and still works o.u. ?
The extra coil is very much an impedance matching transformer, between the high impedance of the Secondary coil, and the low impedance of the Earth, in Wardenclyffe's case anyway.
If we assume the drawing you link is accurate, you can note that connecting coils in parallel ( say 4 coils ) is an excellent means of further reducing impedance.
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