Bob, it has been a few days since I worked on these models, but I think you're right. I made an error on my idea for the bottom of this setup around the radial hub, and that could make some difference to what I posted above.
Hopefully I'm looking at the same model as you are. If so, this was basically the first model, and it was my attempt to duplicate Dave's 1600 setup with short radials that looked to be about 6" below the bottom of his antenna's mounting hub area, the metal part, but without isolation.
As I sit here thinking about your question, I'm also thinking that I should have isolated the mast at the bottom of the radial hub instead of below the antenna mount. When I checked the original isolated model I think you were looking at...I thought maybe I see what you see.
The fix made the model look better in regards to current on the mast and radials, but the primary lobe went down in gain, the secondary lobe went up a bit, and the highest lobe went down a bit. See the overlay attached.
Sorry for the error guys.
Remember, I was just trying to check the currents in this project, and it was ultimately to be checking the currents for an end fed 1/2 wave.
Thanks for your help,
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All the mast are the same height except for the 4" isolation models, and they are all at "0" elevation which means on the ground.
