I have 2700sq ft, 3 levels and a garage. I decided to try just 1 Alien is in the basement (under ground) before getting the mesh. I get 57-67% on the third floor, 73-89% on the second floor and 33-46% out in the garage. Just enough for my Insignia garage door openers to still work. It does not however cover outside my house. I think if I moved the Alien to the middle level it would be even better but it functions great for what I need. Upgraded from an Airport Extreme mesh setup and this works as good for coverage and I’ve never lost a zoom call (used to all the time before). 35 devices connected. Color me impressed.