I've been learning how to make 49:1 auto transformers to run end fed half wave antennas. As I understand it, the twisted lead forms a zero voltage point which acts like a ground.
Assume I'm using coaxial feed line and that the transceiver is also grounded. The inner conductor connects to the first turn and the shield to the twisted pair.
Would it make sense to add a wire from the twisted pair to a spike in the ground ?
My reasoning is that the ground the radio is directly connected could be non-zero or RFI could get on the shield and raise the virtual ground to something not matching the radio end.