gain in cst

No one can help?

What do you mean with broadband gain.

S21

Hi, you mean this?

Macros - Farfield - Broadband FF monitor
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Results - Template based postprocessing - Farfield (broadband)

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@elektr0
It just means gain information at many frequency points.
@eirp
It can work, but it cost too much time and not very straightforward.

There's no other way. Why it's not straightforward? I think it is..
Of course it cost time, farfield is superposition of near field.