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[TowerTalk] Length of Sloper?

Subject: [TowerTalk] Length of Sloper?
Date: Wed, 29 Dec 2010 18:59:01 EST
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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 
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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