There are alot of different variables that will affect the range. A wall in between the device and the WIFI source, with effect the signal, but it depends on the type of material the wall is. Plaster on Wire mesh, no signal. Drywall on metal studs, signal, but degraded. Drywall on wood, better signal, but still degraded. No walls, outside, best signal! 70' is quite a distance inside, and especially if different stories of buildings!