Hi Pete,
Symmetrical T-verticals offer a performance improvement over
inverted-L verticals but with a major downside if you operate on the
higher bands. If the flat top of the T-vertical is near resonance on any
HF band is will significantly degrade the performance of any Yagi
antenna within hundreds of feet of the flat top.
My recommendation: if you're serious about the HF bands don't use
a T-vertical unless you can locate it far from your Yagis.
I learned this lesson the hard way years ago with a 70 foot flat top
on my T-vertical I totally trashed my 3 element 40 meter Yagis
hundreds of feet away.
73
Frank
W3LPL
----- Original Message -----
From: "N4ZR" <n4zr@comcast.net>
To: "topband reflector" <Topband@contesting.com>
Sent: Tuesday, February 18, 2020 4:45:27 PM
Subject: Topband: T-loaded vertical
I keep seeing references to people using symmetrical wire top loading
instead of the single wire of an inverted L. My question is how to
calculate the appropriate length for the two top-loading wires.
--
73, Pete N4ZR
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