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Marconi's done research on this antenna. I'm thinking that A99's have to be grounded only as to provide a path for lightning to follow to earth ground and not one's equipment. I did find a website where the guy rebuilt the coil inside and got a perfect 1:1 match. I'll have to look for that again.

Here's Marconi's take on analyzing a A99

http://www.worldwidedx.com/cb-antennas/158043-marconi-comparison-testing-his-a99-without-feed-line-mast-2.html