Depends on the shape of the antennae, it’s an entire engineering field how to design antennae to achieve desired radiation patterns [https://en.wikipedia.org/wiki/Radiation_pattern](https://en.wikipedia.org/wiki/Radiation_pattern)
No antennae radiates in a perfect 360 though, that’s one of the reasons that modern radio devices often have many antennae, so that one antennae could cover the not so good directions of the others.
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