Andy Cowley wrote:
I think you'd be better of with 102' or 135' rather
than a resonant 80 m aerial as these are easier to match on some of the other
bands.

If he were using 300 ohm or lower Z0 feedline, you might have a
point, but there's nothing to worry about with 600 ohm feedline.

A resonant 80m dipole may have a feedpoint impedance of 60 ohms.
An 80m dipole used on 40m may have a feedpoint impedance of 6000
ohms. In both cases, the SWR on the 600 ohm open-wire line is 10:1.
A 60 ohm antenna fed with 600 ohm feedline and a 6000 ohm antenna
fed with 600 ohm line are equally mismatched. If one doesn't know
the length of the feedline, one can't tell the difference at the
transmitter.
--
73, Cecil http://www.qsl.net/w5dxp



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