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[TowerTalk] Water tower omni

Subject: [TowerTalk] Water tower omni
From: Nick Pair <>
Date: Mon, 3 Jul 2006 18:34:34 -0700 (PDT)
List-post: <>
I vote for the 4 pole folded dipole with the dipoles spaced 90 deg.around a 
mast horizontally and phasing harness distance vertically. The commercial type 
where the dipoles are welded to arm on half opposite feed point. They have 
survived many a strike in commercial installations. You would want to use 
discharge devices above them on support mast and have everything well bonded 
together and to lightning down wire to whatever ground is present at tower 
base. There should be a grid if this is a community water system and access to 
this is important. The individual patterns on these are great enough that you 
get pretty good omni out of a set of four. Use factory spacing from support for 
best omni.
  Also if you can run the feed line horizontally from the support pole base 
through a grounded run of metal conduit just big enough to accommodate the coax 
will choke the large current surge down to a less than melt down level. About 
20 feet will do it.
  That's my $.02 worth anyway, 
  Nick WB7PEK 

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