It's only my opinion, but I think listening and transmitting are a waste of time.
First off, I don't believe our civilization has the technology to receive or broadcast on the kinds of frequencies that interstellar travelers would use.
Secondly, what fool would intentionally broadcast their coordinates when they don't know who's listening? Only a pointy headed liberal wouldn't stop to think that maybe - just maybe, an advanced predator race might pick up their broadcast.
“First off, I don’t believe our civilization has the technology to receive or broadcast on the kinds of frequencies that interstellar travelers would use.”
It depends on how long their projects could be sustained, I suppose. A race that has a natural lifespan of 100,000 years or have beaten geriatric death would plan for the long-haul, they could think pointing a message at potential aliens that takes 50,000 years to get where they are is a good bet. As far as detection ability for decreasing signal, who knows how sensitive such instruments could become.
“Secondly, what fool would intentionally broadcast their coordinates when they don’t know who’s listening?”
That’s what I think too. The first radio broadcast was 100+ years ago, of course we actually pointed a message at specific things in the case with METI, to my understanding.
Freegards