I can only suggest that my experience with several A99's that were not soldered well might suggest a case where we could get lip bit from RF. I never experience that however, and even though the antennas acted bad with TVI, I sensed they performed just as well as I would have expected. At the time however, I was not testing or comparing them.
Bob, I also have tried to make the claim that this is not the way an Imax without radials would act, isolated or not. With the differences noted in the lack of performance for the model without radials and no isolation...folks would surely be able to notice the difference. I would think, 1.02 dbi @ 8* degrees is a big difference from 3.83 dbi @ 8* degrees and that would likely be noticeable.
Regarding Gary's RFI problem, I've heard stories both way with the choke, but I believe what you saw. Personally, I've never experienced much if any change with my best A99, no matter what I tried, isolation, chokes, or radials. This is precisely why I tend to say you might not experience the effects of doing anything constructive at the voltage node end of a 1/2 wave radiator.
Thanks for the details, I'll try several ideas on the Imax and maybe even the A99 model, and we'll see what Eznec indicates. I may post that however, in a new thread. I think d1g1man has lost all hope of getting answers to his questions.
