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Topband: 160 Shunt-Fed Tower Readings

Subject: Topband: 160 Shunt-Fed Tower Readings
From: Larry K4AB <>
Date: Wed, 10 Dec 2014 13:41:03 -0600
List-post: <">>
The antenna is a 94' Rohn 25, with a Force 12 24'boom Delta 6BA
on top. Note that the elements are insulated from the boom. The base
of the tower is grounded.

73 radials are attached to the base ranging in length from 130'-250'.
15,000 feet of radials, average length of ~200'.

It is fed through a  series 1000pF 10KV Jennings vacuum variable.
The shunt is a 4 wire cage about 3" in diameter and attached at ~45'
level.  It is spaced about 3' from the tower.

Here are the readings I get from a RigExpert AA-30 at the feedpoint:

1.830 kHz
Series model: lZI: 59.7 Ohms
R:59.5 Ohms
SWR: 1.23
X:5.6 Ohms
C: 15893 pF

What are these reading telling me,and how can I improve the antenna?

Thanks, in advance!

Larry K4AB
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