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NB, I hope the corrected model I just posted above will help us understand how the currents are working in this 5/8 wave model. As I see things, this does not conflict with the theory as I understand it.

 

So, I added the currents tabular data report for you to check out. The sign of the phase indicates whether the currents are in-phase or not and I marked the report accordingly. You will notice that the bottom part of the radiator is out of phase with the top 1/2 wave portion.

 

It is my opinion that the radials are in-phase with the top of the radiator, but due to the currents running in the opposite direction in the radials...their horizontal RF is mostly canceled. This also agrees with theory, as I understand it.