Bob, is your question referring to the tip of the mast or the radiator? Shockwave if bob is referring to the mast, then I would also like confirmation for how this feature turns off and on with Exnec. At this point when I construct a model the first time I click the "Antenna View" on, the currents are not shown. When I click on details for the "Currents" then the currents shown are displayed in the "Antenna View" as well. But, I'm not sure if I'm seeing both magnitude and phase, or just the magnitude. Can you explain this for me?
Bob, do you mean you see the max (not imax) current node 1/4 wave down from the tip and max voltage at both ends of the upper 1/2 wave?
When modeling I think I saw these higher lobes at a bit less than 3.2:1, but I wasn't sure my calculations were exact either. I did see a tipping point in this are however. Give me your idea of the dimensions for 3.2:1 at 27.205 and I will model it again. Do you think it would have to be the same as the model in the ARRL book or will the Vector model work too?
I think I saved that model Bob, and I'll check and see how long I made the radiator. I have not modeled the Sigma4 yet with the long radials, my most accurate model has measurements for the Sigma4. Maybe soon I'll model the Vector with the dimensions you and MultiMode provided and check your length idea again with the New Vector dimensions. I'm swapping antennas right now. I just took my GM down and put my A99 up without radials. Next, I'll add 4 x 72" A99 GKP radials horizontal, and then add 3 x 102" slanted together with the horizontal. Then remove the horizontal. Lots of work to do, and then the Imax. Some are not going to like my results.
Shockwave or Henry, have you modeled with a mast vs. insulating the mast? My models all show insulating does not improve gain, but I can't explain why. I believe that insulating should improve the current flowing in the radials if available and that should improve something. This confuses me.
