[aidenn0]

6cm is the wavelength at 5GHz and most sensing devices have issues with sub-wavelength objects. If you're paranoid you can hang a bunch of strips of aluminum foil that are 3cm long all around your house, which could confuse the sensor. (see http://en.wikipedia.org/wiki/Chaff_(countermeasure))

[theoj]

Work is underway on 60Ghz Wifi, which has wavelengths of only a few millimeters.

http://www.pcworld.com/article/2030041/meet-60ghz-wi-fi-the-...

In a few years we could have tri-band routers covering 2.4Ghz, 5Ghz and 60Ghz. Correlating the info from all these frequencies should provide a much better picture.