That hole page explains why aliens won’t come visit.

Arecibo's radar had a EIRP of up to terawatts. They were basically pinging space for asteroids etc. It feels a lot like using lasers at a helicopter kind of thing. Quiet and suddenly a sharp pulse.

The cables snapped at some point. These things were tough, able to last decades. This whole thread made me think aliens cut it.

I have seen a crab brush his eye with one of his foldable mouth arms. We already have aliens. They are more weird than anything I saw on star trek.