NetSpot which was available only for Apples OS X up until now, has been released for Windows.
NetSpot can be used for review Wi-Fi networks, finding spots of poor reception, and troubleshooting.
The App is availablehereand is very light at 4.1MB download.
Best of all, its still completely free.
However, the developers said that these features would be added soon.
source: www.techworm.net