realize that even if you aren't putting up a router there are hundreds of other RF signals in the air. Cell phone, tv, radio, and possibly neighboring APs are already covering every square inch of your house. If you would have been harmed by rf chances are the effects would have happened years ago.
FWIW your standard soho router has a very weak signal strength. Maybe 100mw tops. Compare that to an FM transmitter at 1,000 times the amount of power.