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Well, I've partially answered my own question. After a bit of searching I've found on line commentary second hand from the manufacturer saying that these phasing lines do, indeed, measure a DC short.
Also, what's interesting is that mine seems to be assembled partially incorrectly. The VHF elements are supposed to alternate between top and bottom of the boom on each side. Instead half of mine don't alternate, which is different from the drawing in the manual.
I wonder if this might be a minor tuning change, accomplished by adjusting these distances? In any case it seems unlikely to account for my non-existent reception.
I'll call the manufacturer about this problem, but I fear my next steps might be to dismantle the antenna to get it out of the attic and experiment with mounting it outside.
doug
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