i know someone who found out the "proper" strength of a wireless network...by calculating the mean packets...quite clever...i dont think the same could be done with one router but with three, you could get a rough estimate because a router can only send packets a certain distance...if you hacked the firmware to also find the "real" strength, im sure it could be done, but only, as i said, to a certain point of accuracy...
http://hackervoice.co.uk/forums/index.php?...781&hl=wifi
theres the guys post who made it...i think its truly awesome...