The below example is just to show
how such a plugin could be done. It is worth to mention that in most cases it would be more efficient to duplicate an existing Horizontal/Vertical antenna of the antenna library, modify the pattern and rename it accordingly.
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Figure 335336: Simple example for static pattern
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Figure 336337: Configuration panel of the AP example with static pre-set of the antenna pattern
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Figure 337338: Example of (random) antenna pattern