Bombarded: Electromagnetic Radiation of Our Own Making Fills the "Empty" Air

You cannot see them, but radio waves pervade your peaceful living space. They emanate from an increasingly large menagerie of electronic gadgets, appliances and satellites. FM radio and broadcast television have been around for years; more recently, cell phones and Wi-Fi routers have added their high frequencies to the mix

More here:
Bombarded: Electromagnetic Radiation of Our Own Making Fills the "Empty" Air