I have been using at C6AGU a similar design that I call "Fat Vertical".
Scroll down on the C6AGU QRZ.com page to see a picture of it. The antenna is
60' tall with sloping loading wires attached to the outer corners of the
"fat wires". Feed point impedance is 12 - 120 Ohms, which is matched by a
remotely controlled antenna coupler. The antenna stands in salt water on an
aluminum base that provides grounding. No radials.
We used a 43' version on 160 on the 2018 Baker Island DXpedition (43' was
max height allowed by USFWS). The antenna stood at the edge of the water
with two slightly elevated radials. It had decent performance: N4IS in FL
heard me tuning up with 10 W -- in July!
73,
George,
AA7JV/C6AGU
On Thu, 7 Apr 2022 16:00:05 +0000 (UTC) Robert Parkes via Topband wrote:
The design or at least many like it have been around for years.Otherwise known
as a Conical Monopole
73sBobG3REP
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