A solid bolted down dome would solve all above issues but the upper temperature limitation 40-45˚C is just odd.
The board is exposed to around 300˚C when it is reflow soldered with all the SMD components.
Maybe the copper of all the antenna elements expands beyond a tolerable range above 45˚C but with all the very precise phase shifting of the signal for each element one would think it is comparatively child's play to compensate any frequency drift caused by heat.
I think these antennas have to handle a fairly wide frequency bandwidth anyway.
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