I have a friend who is EMF sensitive, that is, if he catches the train into the city, because of all the wireless and mobile phone transmissions, he goes into a kind of fit. If you hide an active wireless base station in a room, he can detect it by feel. When travelling, he has to avoid mobile phone transmitting towers. Unfortunately for him, only fairly recently has his condition been verified by doctors. His room (in a share house) has an internal Faraday cage inside it, and naturally he doesn't own a mobile phone, nor any wireless transmitting devices. When I mentioned this site to him just know, he already knew about them.