If you're really concerned about radiation there are DIY solutions. Rip down all the drywall in your house, attach conductive window screening to the studs behind (making sure to overlap all pieces), attach the screening to a ground, put the drywall back up. This effectively makes your home a faraday cage, and should block all cell, radio, tv, and various other EM signals from entering your home (exept from windows . . . but I'm assuming that you already cover these in tinfoil?). :P
Added prepper bonus . . . your house should now withstand the EM blast from a thermonuclear device pretty well. So all your flashlights and ipods will work in the apocalypse.