Quote Originally Posted by DataNinja View Post
Yeeeeah, I've never managed to stumble upon the Horizon Signal, and... well, they've reduced the chances of it happening now, so I doubt I ever will.

And I don't think there's a way to look back on that history, I'm afraid. Dunno if there are mods that would do it, but I doubt it. Just because there are a lot of pop-ups.
They had for a couple years the horizon signal popping up in almost every one of my playthroughs. It was so annoying I actually consciously had to ignore it.