Buck wrote:
I know I'll be corrected if I am wrong, but if I am correct, the SWR
is high (actually varies by band) on the feedline for the G5RV. The
twin lead portion doesn't have the losses the coax does with that SWR
so more of the signal gets to the antenna than it would if it were
just coax going to a twenty meter dipole.

Here are the 50 ohm SWRs at the 300 ohm twinlead to 50 ohm
coax junction that EZNEC produced in 2001 for a 102' dipole
at 40 feet fed with 27.7' of 300 ohm ladder-line.

3.8 MHz 3.2:1, 7.2 MHz 3.6:1, 10.125 MHz 56:1, 14.2 MHz 4.1
18.14 MHz 37:1, 21.3 MHz 11:1, 24.95 MHz 7.6:1, 28.4 MHz 66:1

The G5RV was designed for 80m, 40m, & 20m operation and on
those designed-for bands does a reasonable job. It works
pretty well on 12m. Less well on 15m. Terrible for 30m, 17m,
and 10m operation.

However, if you are willing to vary the length of the 300 ohm
(or 450 ohm) matching section, you can achieve a reasonable
match on any HF band.
--
73, Cecil http://www.qsl.net/w5dxp

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