I have a similar question (sorry to hijack ). I work in an older building in the center of my town's business district. Since it is a retail store there is no need for mainstream internet access so we don't have it. I like to bring my laptop to work with me because it helps alot with my profession (photo lab technician). I was looking for wifi hotspots so I walked outside into our parking lot, got nothing, continued on into a neighboring lot across the street behind a large three story building and picked up on someone's unsecured wifi (there are house across the street from that lot) and got almost perfect signal, about 90%. Suppose I bought something like a Hawking Hi-gain pcmia wifi card (6dbi) would I pick up on that signal being towards the outer wall of an old concrete building and then being partially blocked by a three story concrete building? Or would the Hawking hi-gain directional dish (8dbi) suit me better?