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Re: [TowerTalk] Two meter side mounts

Subject: Re: [TowerTalk] Two meter side mounts
From: Nick Pair <>
Date: Thu, 31 Aug 2006 00:40:07 -0700 (PDT)
List-post: <>
Hi John,
    I've had just about every type of 2 mtr antenna on a side mount, from 3.2 
wavelength booms to j-poles and collinear. The only ones that were sensitive to 
side mounts were the horizontal ones and they could be tamed with nonconducting 
arms and masts as long as the arms were over a meter in length to keep the 
antenna clear of tower.
  The closest I would mount a vertical would be a 1/4 wavelength from tower. 
The farther you go out the more omnidirectional coverage you will get. You will 
never get 360 degree coverage with one antenna but you can set phased sets 
around tower if complete coverage is required.
  There is nothing special about a J-pole. It is just a end fed 1/2 wave 
dipole. There were even plans to use a J-pole as the driven element in a beam. 
Most of the copper cactus type I have seen mount from the bottom but if you 
needed a second attachment point for stability in high wind you can use pvc at 
the center of the upper 1/2 wave element.
  A simple pvc arm with U-bolt at tower end and a T fitting glued on antenna 
end would be plenty stout. For antennas of this size I've made the whole side 
mount of pvc T's and SS hose clamps.
  If you think you need to tune the antenna you can temporary mount it at about 
5 feet on tower and tune away till you get it where you want it. I've found 
that the formula antennas are close enough for the transmitters I have and with 
low loss coax enough power was getting to antenna to work anything it will hear.
  Good luck on you installation,
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