While I appreciate the plug, there is another issue. No matter what is in the base of the antenna, the fact it is at the base means the efficiency will be about half that of a center loaded antenna, all else being equal. In all fairness, you should publish a schematic of the "loading coil assembly". I suspect Mr. David Benzel's hypothesis is close to being correct. And, I suggest you should send one to the ARRL for testing, which will settle the argument once and for all.