I live in NYC with old, thick walls (and a lot of interference, even on 5GHz). Even though my apartment is small, there are 3-4 walls separating where my AP is

I live in NYC with old, thick walls (and a lot of interference, even on 5GHz). Even though my apartment is small, there are 3-4 walls separating where my AP is (at one end) and the other end of my apartment (the bedroom).