Horizontal long wire MW aerial.

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The more I look into this and the possibility of my earth being used, under fault conditions, as a return to the supply by all the houses in my block, the more attractive your idea of a transformer looks Trevor.
Can you give me specific details of the number of turns on each winding and the size of the ferrite ring. I suppose for conformity reasons it ought to be in a waterproof box outside the house.
Would you use coax to feed into the ATU and or the radio, I believe most old radios need high impedance aerial circuits.

thanks
Mike