I haven't figured out yet exactly what you really mean above, but Shockwave says he does not use any CMC mitigation features on his installations, if he can get the feed point match at or near perfect.
I recently modeled his idea to check out what Eznec might predict. I also tryed his 9212 / frequency conversion factor that he mentioned to HomerBB...somewhere and a while back.
The 3 overlays that I compared below were 2 models of the 0.75w version. One with and one without a choke. I did this because the model without the choke showed a small amount of common mode currents on the mast. So that suggested to me, if I had included a coaxial feed line in the model...the pattern would likely suffer and RFI could present some problems.
The 3rd model was my idea of Donald's antenna using a tweaked version of his 9212 factor. It worked out to be 6" inches longer than my 0.75 wavelength version without a choke. His model showed me no CMC just like he told Homer.
Maybe one day I will try making these models using a physical gamma match on the model. That way I can get the tap point much closer than using the simulated gamma idea I used here. Bob, I can use the specs you sent with your image and dimensions for the New Vector 4K long ago including the capacitor value you posted. That said, I have no idea what Donald's gamma dimensions are with his longer radiator and I won't be asking him anything about the specs for his production antenna.
Below are these 3 overlays, and I noted the radiator lengths for each model including Donald's calculated length for his 0.82 wave antenna.
Bob, get me a EZBob image of the idea you talked about above, OK? Pictures work better for me.
