...Contrary to popular impression, that background
of uncollimated radio and television has
been shown to fade into noise beyond about one
light year. In contrast, METI signals, and a few
planetary radar surveys, have been coherent, narrow
and vastly brighter at-target...
and the reason is here.
I've been googling for this article everywere, because it states what is mentioned by David Brin in the movie: Life after People, as just seen on TV
So this picture below is baloney.
