"Cecil Moore"
But he wasn't adverse to feeding a balanced feedline
from an unbalanced source? :-)
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Regarding the G5RV, what is always forgotten, the balanced openwire
feedline is halfwavelength long for both balanced and longitudinal
modes.

What is the input impedance of the line when in longitudinal mode?

I'll allow you and the other experts to figure out what happens
relative to the unbalanced source. ;o)
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Reg.