Those Cold War systems have since been replaced with much more efficient systems that don’t just spew signals into space, so there’s only a ten or twenty year window during which another civilization could have looked to see those signals. Since then, we’ve become much quieter because signals that can be detected hundreds of light years away are expensive and not necessary for a specie that lives within an 8 minute light radius.
Right, so if another species does what we do, then we'd be lucky if we were inside the 200 ly radius of them at a time where they sent enough signals for us to notice?
