[TowerTalk] Length of Sloper?

[john@kk9a.com]

468 / Frequency (MHz) should get you close, however your tower is really too short for a sloper.  Why not just put up and inverted V?  You can use your TX SWR meter to tune the antenna.  Adding a beam later shouldn't have much effect.

John KK9A


To:  towertalk at contesting.com 
Subject:  [TowerTalk] Length of Sloper? 
From:  RLVZ 
Date:  Wed, 29 Dec 2010 18:59:01 EST 

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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