The first thing they did in radio wouldn't have been ultra narrow band and highly focused communication. So, before they had that they would have evolved through normal radio and then on to more sophisticated forms of transmission.

And, i don't recall saying they were sending "us" signals. Merely, that we would have picked up the signals they were sending for their own use.

I also get the brown dwarf thing and i agree. I'm trained in the sciences. (Advanced degree in organic chemistry.) So, i was just trying a little humor.

Sheesh, people can be so overly serious.