I'm not sure how to get away from WiFi myself, as I work all day in it and have three networks surrounding my apartment. I did take measures a few years back and bought a set of silk sheets for my bed, along with a silk cap to wear at night. I also keep my cell phone well away from me when at home, but carry it on my hip all day at work. I wish I had the answer to getting away from all these signals, but I do not.
I also have noted that when one travels, it is almost impossible to evade the WiFi signals as well, they are in all airports, and most places where one might go for food as well. At least I don't have cell towers close to my home, or rather I don't have a strong signal when there. Maybe I am fooling myself about this one, as it seems we are covered up most of the time with these waves, regardless of where we go.