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That was an impressive post that Jack wrote. The man is obviously well versed in this antenna. I'd like to speak with him at some point and exchange ideas. About the only thing I disagree with is probably a simple typo or misunderstanding. In the following paragraph "As we can see from the above the gamma match is the logical choice for impedance matching and we can re-resonate both the vertical element and the radials by increasing the physical lengths until resonance is re-established at the intended operating frequency. we can lengthen the radials and simultaneously improve the frequency vs. bandwidth attributes AND provide additional physical support for the radials by simply connecting an aluminum loop that will intersect the radial ends while extending the physical lengths of each from 89.5" to 107".

Shouldn't the last line read "We can lengthen the radials and simultaneously improve the frequency vs. bandwidth attributes AND provide additional physical support for the radials by simply connecting an aluminum loop that will intersect the radial ends while extending the electrical lengths of each from 89.5" to 107". It is the electrical length that is increased by adding the loop. That's probably like my "diameter vs. circumference" typo.

This helps explain why increasing the loop diameter increases gain. Increasing the angle between radials and radiator improves the match the gamma will have to compensate for as well as having a nice effect on lowering the angle of radiation. It also explains why you would shorten the radiator as the loop circumference is expanded due to the capacitance effect the angles create.