Topband: Top Band Antenna

[donovanf at starpower.net]

Hi Rodger, 


You will have better success if you add a top loading wire to your mast, 
which makes it into an inverted-L. Suggest you start with an 80 foot wire 
in a straight line if possible but otherwise route it any shape necessary . 
You can increase or decrease the length of the top loading wire to improve 
the match. 


As an alternative to shunt feeding your mast, you could simply install an 
130 foot inverted-L parallel to your mast and direct feed it from the 
bottom. 


You could add a loading coil to the wire if 80 feet is too long. 


73 
Frank 
W3LPL 

----- Original Message -----

From: "rodger bryce" <gm3job at hotmail.com> 
To: topband at contesting.com 
Sent: Friday, August 7, 2015 2:54:40 PM 
Subject: Topband: Top Band Antenna 

Gentlemen, I have the following which I would like to turn into a topband antenna if possible. My mast is approximately 40 feet high and there is rotor cage with a 10 foot stub mast, on the stubmast I have an 8 el.log periodic and above that a rotary dipole for 30/40m. 

I attached a drop wire at approx. 38 feet high, I grounded this wire and tried to grid dip the wire plus mast, all as per ON4UN's book "USING THE BEAM TOWER AS A LOW BAND VERTICAL" the results were zilch, nadda nothing at all, no dip anywhere on any band. I used the MFJ 259B with the GDO accessory. 

1. Am I doing this all wrong......highly possible.!! 
2. Is the mast not high enough to be used for top band.? 

I am totally out of my depth here.........so any guidance would be much appreciated. 

Many thanks, Rodger/GM3JOB 

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