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Possibly. If there's significant coupling between antennas in an array, then that means the amount of RF power incident on a PA's output isn't just the reflection from its own output power, but also the power transmitted from other channels. If the coupling is strong enough, then this can affect the PAs' efficiency, linearity, or reliability.

In some applications, isolators are fitted to each PA to prevent the PA's from "seeing" this coupling (though the coupling does still affect the antennas).