Earlier quoted context omitted.
The fact that all SETI endeavors haven’t really found anything is actually a very valuable result, because it constrains “they’re everywhere, we just haven’t been looking” arguments quite a bit. Even humanity’s (weak) radio emissions would be detectable from tens of light years away, and stronger emissions from much further. So the idea that intelligent life is absolutely everywhere that was liberally tossed around a…
>Even humanity’s (weak) radio emissions would be detectable from tens of light years away, and stronger emissions from much further. That's not true. Non-directional radio transmissions (e.g. TV, broadcast radio) would not be distinguishable from cosmic background radiation at more than a light year or two away [0]. Highly directional radio emissions (e.g. Arecibo message) an order of magnitude more powerful than the…
When you say perfectly aligned, what kind of precision are we talking about? If we aimed a receiver at a nearby star, would we be able to achieve this kind of precision?