I think that Shockwave is of the opinion, like me, that both the Imax/A99's matching section provides enough control for that antenna to work flawlessly with out the need for radials, and that is likely due to the matching scheme.
Personally, I go a step further, I don't believe a 1/2 wave radiator needs radials at the tip of the antenna's voltage node, simply because there just ain't much current there for the radials to use.
Now I'll admit that my models do show radials at the bottom of a 1/2 wave vertical, end fed 1/2 wave do tend to decouple the antenna from the mast somewhat, but when looking at the results real close, and not just looking at the pictures, I see there is not enough difference to make the modification worth the effort.
That leads me to my next "Marconism." When someone tell us this or that will make a difference, "...I always ask, how much difference are you talking about."
Then we usually have a lot of silence to follow, or the thread just stops dead, even when <gotproof>.
