Although your method works well you unfairly attribute it to the G5RV. This
undeservedly attaches prestige to that over-rated antenna.

Immediately you change the length of the feedline from 1/2-wavelength at
14.15 MHz it is no longer a G5RV.

And in addition to a top length of 102 feet there is an enormous number of
other top lengths which will work in the manner you describe. 102 feet is
no more magical than 118.5 radials.

Do you hold shares in a G5RV manufacturer? ;o)
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Reg, G4FGQ