Hello CMDRs,
Sorry for the late post.
These are some of the systems where I have found UAs. Your luck may vary as it is an RNG roll.
1. ARIES DARK REGION GW-W D1-52
2. ARIES DARK REGION OJ-P B6-3
3. ARIES DARK REGION XK-N B7-2
4. COL 285 SECTOR FB-X D1-46
5. HIP 14479
Remember to head out from the main star, preferably 150ls out, looking for "Anomaly Detected, Threat 4", signal sources.
Have fun, fly safe. o7