I think you missed the note of utter sarcasm that was meant to be obvious in my post, Dave
I.e. that a common earth with large circulating currents is a disaster, but there is nothing ultimately wrong with a large unbalanced coax feeder (as long as its not manipuleated) for a low impedance microphone.
If you want more, sticking a transformer on the end don't cut the mustard, but using TWIN balanced feed in a seperate shield does,
However what is under discussion is nothing more or less than a length of 75ohm coax, which it is claimed 'will pick up signals in the sheath'
well so it will, but thats why its earthed and a coax. So that all that signal is applied equally to the 'cold' side of your RF input stage. How you drive it isn't going to effects its properties as an aerial.