WTF people, they haven't been proven to exist yet...
So exasperated about the amount of accumulating scientific articles about the search for ET. Can't we just stop looking for them? What are they are they good for anyway? their lifestyle is probably too exotic and incompatible with ours anyway, assuming they are out there. Why chance wasting funds for an unknown but possibly an insignificant probability of discovery? At least let's build real sensitive detection instruments before throwing billions and billions of dollars to futile SETI!!! Intelligent radio transmissions... Really? That's what we're looking for?
It takes careful calibration of machines and planning to detect just high energy electromagnetic radiation that originates from cosmic events, like those from magnetar's pulses or hypernovas for instance.
Also there is no way in hell an interstellar civilization is using electromagnetic radiation for anything, again assuming there is one out there. I can't emphasize often enough, intelligent aliens are still hypothetical.
Stupid Carl Sagan and his gullible followers.