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QHA with radiation to the horizon


I've seen your QHA designers, and I would like to ask for the 1.5 turns QHA.

It has a very strange width/heigh ratio (0.0783).

In fact, I would like to have a radiation pattern something between 1.5 turns and 1/4 turns 0.3, but don't know how to get something in the middle.

How did you arrived to this combinations of parameters?

Thanks for your help,