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[TowerTalk] Square Quad Loop

To: TDXS List <tdxs-list@tdxs.net>, Towertalk Reflector <towertalk@contesting.com>
Subject: [TowerTalk] Square Quad Loop
From: Byron Tatum <bjtatum1@att.net>
Date: Fri, 22 Oct 2021 16:20:18 +0000 (UTC)
List-post: <mailto:towertalk@contesting.com>
Seeking Advice -     I have studied the square quad loop (wire hung in a 
vertical plane) a lot in ON4UN's fifth edition Low Band DX'ing HB. I am 
considering installing one for the low end of 80 meters for DX CW work. My 
thoughts are to install one in-between two towers. The towers are 130' and 110' 
and about 100' apart. No guy wires are in the run where the loop would be.     
What I cannot decide upon is whether to feed the loop for vertical or 
horizontal polarity. I have studied the charts extensively in the ON4UN HB. I 
looked on the US soil conductivity map for my area, in Houston County near 
Crockett, TX. It shows a poor soil conductivity, a 4. The best conductivity 
shown is 30 and the worst is 2. I was surprised at this as I see traces of iron 
ore in the ground in spots. I have dug quite a few holes, most 5 feet deep, 
here on this 8 acres and have not encountered a seam of iron ore but find a 
fair amount of ironstone chunks.      According to the info in ON5UN's HB the 
vertically polarized quad loop is the best DX antenna BUT it needs good soil 
conductivity to perform well. The vertically polarized quad loop does not 
benefit much from increasing the height of the loop, it mainly benefits from 
good soil conductivity. Since I could get the bottom wire about 25' to 30' 
above the ground I am considering the horizontally polarized quad loop as the 
radiation angle does decrease some as you get it higher and the gain increases 
some too. Still, though the horizontally polarized quad loop appears to be no 
better than a 40 degree or so angle with most radiation at higher angles.     
Thought I would ask if anyone here has tried these antennas and might have any 
recommendations. Also am curious if I should accept soil conductivity figures 
on map or attempt to find out my conductivity by other means before ruling out 
vertically polarized quad loop.Thanks,Byron W5FH
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