I like this article from Ben Goldacre:
"Meanwhile I have nothing to declare but my cheekiness, and if I was very worried about the mobile phone network being a danger to health ? which could well turn out to be the case - the first thing I would do is campaign to make my own mobile phone operator erect their mast as close to my house as possible.
Pay attention. The one thing that people who worry about the health risks of mobile phone masts tend to forget is the inverse square law: the power of the signal falls away extremely rapidly as you move away from the mast, much faster than you?d think, exponentially in fact, because the energy is dissipated and spread out in 3 dimensions like a big, ever-growing sphere. A bit like how the skin of a balloon gets thinner, the more you inflate it.
Meanwhile you?re holding a dirty great big transmitter right up next to your brain in the form of your mobile phone. In fact, because of the inverse square law, the phone gives you a far higher dose of evil rays than the mast. Go on, press it harder, I can?t quite hear you. But mobile phones, very cleverly, preserve their battery life by transmitting a much weaker signal into the air (and therefore also your head) when they detect that a mast is very close by. If you have a phone, it?s in your interest to have it transmit at the lowest power it can manage, which means a strong signal from the mast, which means the mast is on your street. I don?t expect you all to start campaigning at once."