If you looking for free 802.11 (WiFi) network discovery tool , you can use this freeware - NetSurveyor. This program will gather information about nearby wireless access points in real time and display it in a useful way. Similar in purpose to NetStumbler, it includes many more features. The data is displayed using a variety of different diagnostic views and charts. Data can be recorded for extended periods and played-back at a later date/time. Also, reports can be generated in Adobe PDF format.

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