On Oct 28, 10:04*am, Jay in the Mojave wrote:
Hello Jim:
Yeah 18 feet seems top work well in a mobile installation. Why is that?
Is it because the antenna puts RF Energy on the coax outer shield due to
a lack of ground surface. In all my antennas installs it seems that way.
So 18 feet of coax is roughly 3/4 of a wavelength, ( with a velocity
factory of .66) and any RF Energy coming back will have to come back
thru another 3/4 wavelength of coax.
Maybe that length vs wavelength is the best to use. Your comments....
Jay in the Mojave
jim wrote:
* Feed length 'does' make a difference
when calculating swr 
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idiot