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Homer here is my model of your 6 meter Vector 4K, in Free Space, over real Earth, without common mode current mitigation, and with a choke added. I did not use taper, so I had to average the radiator diameter and used the tune for the length. 


Your radiator length shows to be about 10" longer, but the radials length and the loop diameter are pretty much what you posted. I had to make the loop wire diameter 0.29. I also made a mistake on the Radial Loop detail showing the diameter as 0.16" for the loop wires. They should be 0.29" inches as you will notice in the image of the radial Loop.