There has been plenty of debate on what radio fields generally cause, and do not. The scientific (i.e. proper peer reviewed pubshished research) consensus is, more or less:
- radioelectric fields have physical effects when they are strong enough to cause tissue heating
- they have no physical effects whatsoever on humans other than those eplained by heating
The psychological effect is something else. While in the US the debate may be over WIFI signals, its more about UMTS base stations here. It makes the news once in a while when people complain of all kinds of adverse effects after an antenna has been installed.
One case i distinctly remember was a textbook example of the vague complaints people claim to experience, in the months after a cell/umts tower was installed. Journalists wanted to investigate this one further, and proceeded to contact the telecom company that owned the antenna to learn about its power output and such.
Imagine their surprise when the telecom company indicated that while the antenna had been placed, they had not been taken into service yet, and had never emitted any signal apart from a brief test after installation.
This is fairly typical of these cases. Even people that claim to be sensitive to radio fields never show that in a well designed blind test. I'm confident that there is no human on earth that can tell if an wifi access point is emitting any signals from 10 feet away as long as they dont get any visual clues.
Thermal effects are very real though, comparable to sticking your hand in a microwave oven when its running. This could to some degree explain some experiences with cellphones, where the antenna is very close to body and the output power can be as large as 2 watts. For a phone this problem is very easy to solve: just use a wired hansfree set to keep the antenna away from your head.
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LOL@ aniti radiation paint...
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Radiowave absorbing paint actually exists. Its mostly used to keep signals from leaking to the outside in tempest scenarios.