Annually our class studies wireless technology and its implementation into homes and industry. Surveys are conducted to analyze security used, transmit power and geographic location of wireless technology.
According to Wigle.net, Security has improved over past years. Home users are still setting up their wireless wrong by not providing a WPA2 (AES) form of encryption.
Approximately 23% of home users still have open internet that neighbors or anyone passing by can use. Vendors have tried to make setting up wireless easy and secure by providing WPS and/or a setup utility disk that walks the user through step by step. Once you have secure wireless, you should change the password periodically to prevent users from learning what your passphrase is.
Wigle provides a map of wireless throughout the globe. As users find wireless, they upload their data to Wigle and the database is free to the public.
With GPS technology today, anyone including malicious wardrivers can map out coordinates of unsecured wifi. Make sure you secure your wifi.
Note: During a survey we do not use packet analyzers or methods to see data on the wireless networks.