I connected my network with my neighbor living 6 floors above, to share Internet access as well as downloaded files. There was fortunately an equally tall building about 30m across us, which we used to reflect the signal off. An 8dBi yagi was used with a PCI wireless card on my neighbor's end together with Vista's layer-3 bridging, and a Linksys WAG54G on my end. The setup (as can be seen in Fig. 1 and Fig. 2) is quite ghetto, with the antenna "mount" being made out of styrofoam and gaffer tape.

Speed tests were initially 50KB/s, but after a little fiddling a one sweet spot (+- 5 degrees?) was found where 1MB/s was achieved. Pretty shocking given that we were going to write it off already!

Figure 1 - 8dBi yagi at neighbor's

Figure 1 - ?dBi rubber ducky at my place