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Re: [TowerTalk] Length of Sloper?

To: <>
Subject: Re: [TowerTalk] Length of Sloper?
From: "Stan Stockton" <>
Reply-to: Stan Stockton <>
Date: Wed, 29 Dec 2010 18:22:42 -0600
List-post: <">>

Quarter wave slopers just don't work well unless there is top loading - 
at least that has been my experience.  If I had a 60 foot tower I would 
shunt feed it and use it as a vertical.  You will be quite pleased with 
the way it will work with a reasonable ground system under it.  I will 
work fine with a small tribander for 80 and 160 so your ground system 
will be good for the future.

To answer your question, I would be prepared to make it a LOT longer 
than you think it should be.  I would start out with about 85 feet of 
wire and fold it back a couple feet at a time to get it in the band 
where you can then finalize it.  I think you would be better off with an 
Inverted V at 60 feet and then shunt feed the tower after you get the 
tribander up.

Stan, K5GO

----- Original Message ----- 
From: <>
To: <>
Sent: Wednesday, December 29, 2010 5:59 PM
Subject: [TowerTalk] Length of Sloper?

> Hi Guys,
> I'm installing an 80-meter Sloper on a self-supporting 60'  tower. 
> (no
> guys)  I don't have a MFJ-259 or other antenna bridge  with me so I'd
> appreciate your thoughts to help get me in the ballpark.   The 
> 80-meter Sloper will
> attach to the tower at the 55'  level.  Currently there are no other 
> antennas
> on the 60' tower.   A couple questions:
> 1) With no other antennas on the 60' tower, do you think the length of 
> the
> Sloper wire will be close to the formula 234/freq?  Or do you think 
> the
> Sloper will wind up needing to be  longer or shorter than  234/freq?
> 2) The once I get the Sloper tuned for minimum SWR on 80-meters, if I 
> later
> add a Tribander to the top of the tower I'll no doubt need to re-tune 
> the
> Sloper, but do you think the Sloper will need to be shortened or
> lengthened after the Yagi is added?
> Thanks & 73,
> Dick- K9OM
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