> I haven't seen any anti-METI argument which counters this: > "Humans, Vakoch said, have been using radar, which can purportedly be detected 70 light-years aw

> I haven't seen any anti-METI argument which counters this: > "Humans, Vakoch said, have been using radar, which can purportedly be detected 70 light-years away, since World War II. Television and radio signals would long ago have signaled our presence to malevolent space ruffians, he said." I think the key word there is "purportedly." Has anyone done an analysis about what kind of equipment would be required to detect those old signals at 70 light years? Has there been any analysis of how for out they could propagate until they were totally overwhelmed by noise? Personally, I'm skeptical that those signals were transmitted powerfully enough or focused narrowly enough to likely be detected. This article (https://www.nature.com/articles/461316a https://www.nature.com/articles/461316a) makes it sound that way: > Indeed, SETI is marked by a hope, bordering on faith, that not only are there civilizations broadcasting out there, but that they are somehow intent on beaming their signals at Earth. An alien SETI project relying on a similar faith in Earth would be sorely disappointed. It's true that a random mix of radar and television signals has been expanding outwards from Earth at the speed of light for the past 70 years. But there have been only a few short-lived attempts to target radio messages at other stars — with each attempt arousing concerns over alien reprisals.