Reg Edwards wrote:
Cec, the facts are, G5RV never mentioned Zo, ...

Now Reg, you know that most statements using the word
"never" are false. Here's a quote from G5RV, himself,
from "The G5RV Multiband Antenna ... Up-to-Date" in
The ARRL Antenna Compendium, Vol. 1.

"If you decide to use 300-ohm ribbon type feeder for
this (series) section, it is strongly recommended that
the type with 'windows' be used. ... Since the VF of
standard 300-ohm ribbon feeder is 0.82, the mechanical
length should be 28 ft. However, if 300-ohm ribbon with
windows is used, its VF will be almost that of open-wire
feeder, say 0.90, so its mechanical length should be
30.6 ft."
--
73, Cecil http://www.qsl.net/w5dxp