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You know copper is going to stretch, and who knows exactly how much without a couple years of testing, but I imagine 5-10 channels high would bring it down about right in a year or three, but what if it doesn't, it's only 5-10 channels from flat and most people use their antenna systems a lot farther away from center than that so no biggie either way.

I'll just do mine that way when I build another Quad this year.