SPOILERS ahead
Something seems to be wrong with the frequency of the unique signals in the latest patch. In 6.0 I managed to filll the entire gallery in about 35 days, in 7.0 I only got about ten unique signals in 45 days. It was all asteroids and planetoids filler signals. My friends had the same issue. Not a single one of them got the Evil, even though I was sure it's scripted to apper during day 30, which is a massive shame since collecting the bits of its story is one of the best experiences I had in this game.
Great work with the new base though, I love it! I hope there will be some events with the creepy coldroom in the future.