Heh. I have the 5dBi antenna near a window on the northeast side of the house, so the coverage you saw makes sense. I'll have an externally-mounted omni in the next month or so, and coverage should be much more interesting then.
I just made a couple of antennas, one a directional cantenna and the other an omni, and will be testing them next weekend. Join kcwireless-talk on
www.kcwireless.net if you're interested in details on how that all goes, or want to come out for the testing.
-glenn