Velostat, my good man.
Y-Shield your entire home. Tested up to 18 GHz!
YShield High Frequency Shielding Paint
Easy to apply water-based paint for walls, ceilings, doors and other interior OR exterior surfaces. Very effective for blocking cell phone signals, CB, TV, AM, FM signals, radiofrequency radiation and microwaves. Tested highly effective up to 18 GHz!
Sadly, EM-resistance of your siding insulation is not something property inspectors typically check for unless they work for the United States government.
Moving to Canada solves everything quite nicely.
Newfoundland sounds pretty damn good this time of year.
That reminds me, haven't watched Lexx in a while.
God dammit that show was awesome.