I don't have the technical capability to do it, but it would be great to know how to cover the wifi transmitter on the TV (like we do cameras on our laptops), but with an electrical barrier tape (Yes, i'm trying to avoid saying "tinfoil.")
Maybe someone could even put together a repository of diagrams to show which areas need to be covered.
I don't think that would be likely to work very well - besides being somewhat impractical, most RF electronics are already covered by metal 'cans' to prevent excessive EMI from escaping. You might be able to find the antenna and wrap foil around it, but that just sounds like a recipe for shorting something out once the foil gets unwedged/unstuck.
Plus, tin foil hats can actually improve signal reception around the 2.5GHz range used by WiFi :P
Maybe someone could even put together a repository of diagrams to show which areas need to be covered.
Would be a fun to see for us paranoid people.