Stacking antenna with cst

Hello
I need to stack two helical antennas in cst
because antennas are in uhf range these are wide around 2 wavelength and I used Integral equation solver

Now in order to stack two of these antennas how to set the excitation port correctly to get a single farfield?

file is attached

Thanks

Helix antenna is not well calculated ... !!!

what do you mean?
I've developed and tested several helix antennas for various frequencies and all are gone well...

In integral equation solver I want to find the possibility to feed simultaneously the two helix (I tried but I got two different farfields instead of one...)

,,,I don't think so...!!

,,,for Array Antenna...

This should work
Thanks!