On 10/20/20 11:10 AM, amfone via TowerTalk wrote:
But if its a vertical positioned dipole it does not need a counter poise or
radials as its a dipole. A vertical dipole has a pattern and low take off angle like
a true vertical but the feed line must come away from the center at a 90 degree
angle for best performance for several feet.
Or as is done in some antennas, down the inside, with a good choke.
10-15 ft of decent coax won't introduce that much loss with the matching
network at the base.
I think the key would be to keep the active length less than around 3/4
wavelength at the highest frequency of operation to keep the feedpoint
impedance not too high. So on 10m, that would be 7.5 meters which is
about 25 feet.
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