Essentially all 1920s AM broadcast stations used roof top antennas
until the 1/4 wave vertical with 120 1/2 wavelength radials became
the standard in the 1930s
73
Frank
W3LPL
----- Original Message -----
From: "Hamilton Hicks,Jr" <ham306@bellsouth.net>
To: "Mark" <r-emails@n5ot.com>, "Kenneth Grimm" <grimm@sbc.edu>
Cc: "topband" <topband@contesting.com>
Sent: Friday, April 8, 2022 5:57:03 PM
Subject: Re: Topband: Skirted vertical antennas for MF broadcast
Some years ago, I recall an AM station in Washington, DC, having their tower on
the roof of a three story building. It was either a unipole or had skirted
radials. I want to say that it may have been1340 khz.
HamKB4BR
On Thursday, April 7, 2022, 12:54:47 PM EDT, Kenneth Grimm <grimm@sbc.edu>
wrote:
The first time I saw one it was called the Folded Umbrella and was
popularized by the late WB5IIR, John Haerle. He wrote an article for HR in
May of 1979. He also described it in his book, "The Easy Way." I've been
using my own version of the basic design on 160 for several years.
73,
Ken - K4XL
On Thu, Apr 7, 2022 at 12:24 PM Mark - N5OT <r-emails@n5ot.com> wrote:
> Conical Monopole
>
> Say that fast 3 times:
>
> Conical Monopole
> Conical Monopole
> Conical Monopole
>
> Right. The first time I saw one, it was called a Folded Unipole. My 160
> support can be probably 80' or 24 meters. I have considered my options
> for broad-banding it for 160. This is one of the choices.
>
> Mark N5OT
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--
Ken - K4XL
BoatAnchor Manual Archive
BAMA - http://bama.edebris.com
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