just about 15m, but it needs to go through a wall. It’s not even a big apartment, and the walls are not that thick, but as it’s in 1 direction, I’ll try to get a directional antenna as the other commenter advised. Also probably any long-range device will be better than the cheap Wifi 6 Archer that I bought (although it was a great improvement for short range ping time compared to the Wifi 5 router that I had before)