I have a Asus wireless router in a closet in the middle of our house (wl-520gu). On the north side of our home lives all the devices needing to connect to wifi (PC, TV, tablets, etc.)...on the south side is where all our bedrooms are, including the baby's room. Without getting into a debate about the safety of wifi signals, I'd like to ask if it is possible to block (or severely reduce) the wifi signals emitted to the south side of our home while keeping the signals sent to the north side? Is there a material or technique I could use to accomplish this?