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DB, I took a shot at duplicating your model using Eznec, and I think I got close. I made one just like your model with without a mast to the ground. I also added an ISO mast to the ground for the other. They both seem about the same.

I also added an X in the antenna view where my wires are ISO, not connected.

Your isolation (ISO) fix does look to minimize the CMC's on the mast of your model better than my "Imax no radial 32' mast ISO" model.

But, in my PDF file below you will see that my model does not raise the maximum TOA up high...like my version of your model does. See the pattern overlay I added for comparison.

In these models, I also can't blame the differences in the patterns we see due to the very high SWR mismatches in my Imax models. These three models all show nearly the same mismatch.

<blockquote data-quote="Marconi" data-source="post: 549475" data-attributes="member: 903">DB, I took a shot at duplicating your model using Eznec, and I think I got close. I made one just like your model with without a mast to the ground. I also added an ISO mast to the ground for the other. They both seem about the same.I also added an X in the antenna view where my wires are ISO, not connected.Your isolation (ISO) fix does look to minimize the CMC&#039;s on the mast of your model better than my &quot;Imax no radial 32&#039; mast ISO&quot; model. But, in my PDF file below you will see that my model does not raise the maximum TOA up high...like my version of your model does. See the pattern overlay I added for comparison.In these models, I also can&#039;t blame the differences in the patterns we see due to the very high SWR mismatches in my Imax models. These three models all show nearly the same mismatch.</blockquote>

[QUOTE="Marconi, post: 549475, member: 903"] DB, I took a shot at duplicating your model using Eznec, and I think I got close. I made one just like your model with without a mast to the ground. I also added an ISO mast to the ground for the other. They both seem about the same. I also added an X in the antenna view where my wires are ISO, not connected. [I][B]Your isolation (ISO) fix does look to minimize the CMC's on the mast of your model better than my "Imax no radial 32' mast ISO" model. [/B][/I] But, in my PDF file below you will see that my model does not raise the maximum TOA up high...like my version of your model does. [I][B]See the pattern overlay I added for comparison.[/B][/I] In these models, I also can't blame the differences in the patterns we see due to the very high SWR mismatches in my Imax models. These three models all show nearly the same mismatch. [/QUOTE]

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