I have never found this to be true so I did a quick model and EZNEC shows
that a .28wl vertical has an SWR of over 3:1.
Subject: Re: [TowerTalk] Elevated vertical
From: Ken <email@example.com>
Date: Fri, 23 Dec 2011 17:46:57 -0500
I disagree. If a quarter wave vertical or ground plane is lengthened to
.28 wavelength, the radiation resistance raises to about 50 ohms and a 1:1
It is not resonant, but it has a lower SWR than a "resonant" antenna.
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