Not long ago a customer offered me a slightly used Linksys BEFW11S4 ver. 4 wireless router for free. He had replaced it with an 802.11g router (this is only a b) shortly after purchase and said if I knew anyone that wanted it I could have it. Well, it’s hard for me to let tech pass through my hands without taking a look at it and testing it a bit. So, one of the first things I did was test out how well the wireless signal was received from a basement. (Concrete block walls, dirt, etc. blocking..) I was surprised at how well the signal did through concrete, dirt and a couple hundred feet of air.