Bob, here are the Free Space and Real Earth models for the Vortex Q82M2 antenna. I was able to get this antenna tuned pretty close, and the Average Gain = 0.999 = 0.00db error correction.
So, you're right this model is difficult to tune as a model when placed over Real Earth. I think I still did some guessing for dimensions for the gamma and the connection points near the bottom of the antenna.
I also used the scale feature to bring a New Vector 4K to 50 MHz and then I fixed the taper and made the other dimensions.
Concerning the issues about steering the S4/NV4K designs, I also posted what the Roy's manual tells us about Free Space models and the Ground.
So again, I was wrong and it is possible for this Vortex design to steer the take off angle below the horizon, but angles below the horizon can only be demonstrated in Free Space Models.
Roy tells us why in the section I posted below and it makes sense.
This model also clearly shows us a lot more of the bandwidth than Vortex reported. The steering idea that you've told us about is also exposed in my model as well.
Maybe this effect has something to do with the DX you've talked about in your antenna. Plus if you check the antenna view with the current phase turned on, you can see the bottom 1/2 wave cone seems to be producing more RF than the top 1/2 wave radiator just based on the red line noted.
My model's Tabular Currents Log also shows the currents in the top and bottom are in phase, but IMO the antenna looks lossy at the top.
