Darwin, Keith wrote:
Having done a lot of research regarding verticals I'm rather untrusting
of the "no radials" lie that Cushcraft and others keep pushing. Sorry,
but no radials means you have a lossy return path.
Not true, really. The "no radials" verticals such as Cushcraft's
actually are vertical dipoles, perhaps with some loading to shorten the
radials. I built a 40 meter vertical with a 33' vertical portion and
four 8' inductively loaded radials (the inductance is common to all of
the radials). According to EZNEC, the gain is about half a dB lower
than the same antenna with four 33' radials. And as Moxon points out,
the chance of obtaining good current balance in the radials is much
better with this system (an imbalance results in unwanted high-angle
radiation). The antenna works quite well.
Of course, using a plain ol' 1/4 wavelength vertical with a poor radial
system is asking for trouble.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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