I just hot glue the loops to the roof inside, so it being stiff isn't a huge factor. I once tried a really large coil of #30 wire-wrap wire for the antenna, about 50 feet. It was a pita to get it all laying on the roof and secured, and I didn't see any operational difference. However, when I took a DC reading on the R2LC receiver signal strength pin, I did get a nice increase in signal over the standard antenna on the bench.
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