[OT]What router do you have? I can successfully connect to my router (in the building) from 15-20 meters (haven't checked further, but the reception is quite good, so I guess I could get 30-40m easily), which gives me (pessimistic variant) over 700 square meters of signal (the circle: 3.14*15*15). If you can connect to your router via wifi from 10 meters, you already have over 300 square meters (3.14*10*10 = 314).[/OT]