Neat hack but aren't there free tools to do this with a laptop and its wifi adapter? http://www.ekahau.com/wifidesign/ekahau-heatmapper http://www.ekahau.com/wi

Neat hack but aren't there free tools to do this with a laptop and its wifi adapter? http://www.ekahau.com/wifidesign/ekahau-heatmapper http://www.ekahau.com/wifidesign/ekahau-heatmapper