Would still like to know what you are going to do about the radio waves around you at night, and what about the the natural pd in the air, there is a pd of approx 1000V per metre.
The radiation (radio) from a plasma screen TV is quite high, much higher than a PC, and just the wires running through your house will cause quite strong fields. And thunder storms? Cell phones? WiFi? Bluetoth? Car remotes? Wireless phones?
Of course it will help to make sure there is a plug in every socket to prevent the electricity leaking out