I'm trying to find out what material might best block or limit radio frequency interference (or at least I think thats the problem, as I understand it). I have a phone, the antenna inside the phone is next to a chip that controls a touch button. Whenever the phone boosts the signal to connect to the cellular network, the touch button goes crazy. I have seen a fix for this that includes two layers of duct tape and a piece of aluminum foil covering the chip, but I'm curious to know if there is a solution that will work better. Perhaps using a piece of copper instead of aluminum, or a type of tape that will work better than duct tape to cover the chip in question. Thanks!