eddie,
i agree isolating the mast alone is useless, those currents don't care if its mast or coax outer braid, if the cm impedance is low currents will flow and spoil the party,
you cannot isolate an endfed without adding radials or some other conductor for return currents, kirchhoff won't let us,
i also believe w8ji when he tells us a 5/8wave is worse in this regard than a 1/2wave,
im also certain you can have lip & hand biting rfi and terrible tvi when using an A99 and that adding radials and isolating can reduce that to insignificant levels as i reported in the past,
w8ji tells us he had to add a radial below the choke to make the current near zero, i trust ji is telling us the truth as seen in his models,
we have never put a second radial below the choke but we have reduced mast/feedline currents significantly using the method i described while improving signals and sometimes reducing noise in the receiver,
of course the ground is in the mix and imho should be included in the models too.
