"Today, Wi-Fi access points everywhere, and users becoming
increasingly more sophisticated in their wireless network
knowledge. One good tool for discovering Wi-Fi access points is a
command-line utility called Kismet. It can help with a range of
issues, from diagnosing Wi-Fi interference problems to finding a
particular network in a sea of airborne bits.
"For example, while configuring your own access point, you can
use Kismet to see which channels are being used in your area. Start
Kismet and let it run for a few minutes with channel-hopping
enabled, so Kismet can scan the entire range of Wi-Fi channels, and
it will find all the access points within range. You can then set
your access point to an unused channel, thereby minimizing
potential interference from all the other ones. Once your wireless
network is configured, Kismet can check that you're on your chosen
channel and that encryption is working..."