802.11 wireless networking: channel survey
The survey itself was a bus ride from Midway Airport to Hyde Park via 55th street. The laptop running Netstumbler was closed and sitting in a backpack, with no attempt to improve the signal in any way. 367 networks were detected. It is clear that significant amounts of networks were not found because of the location of the antennas--a previous survey of a few blocks in a well-to-do neighborhood near the University of Chicago (Hyde Park) showed over a hundred networks with a five block walk and a sensitive USB wireless adapter.
22% of the networks did not have encryption turned on. This is not really a bad thing--you shouldn't rely on a completely broken encryption (WEP) to protect your communications. Instead, run a SSH tunnel or a VPN to ensure all communications are secure.
I suppose at this point, from the results of this look, if someone asked me for help about their wireless problems, I'd immediately tell them to switch channels on their access point. A smarter (and probably paid) consultant would scan their location and pick the least populated channel, whatever it was (and odds are it wouldn't be channel 6). That, or switch to the much less popular 802.11a, which runs at 5.8GHz.