Punkuk: Pick up a 12 gauge or 14 gauge IEC power cord at your local electronics shop for around 10 to 15 bucks. It has 3 to 4 times the conductivity of regular power cords.
The problem with RF and EMI is that after you spend a few hundred bucks to rewire your house with armored Romex; you forget that the shielded Romax is made for mechanical protection and general earth grounding, not EMI shielding. If you want to shield for RF and EMI, then use some 3/4 inch copper pipe as your conduit and run 10 gauge stranded wire inside it. Also run an earth ground as well. Aluminum conduit isn't conductive enough to shield well. But, it is way better than the armored Romex.
Of course, you have miles and miles of bare wire outside your house picking up EMI, RF, etc that this setup won't eliminate.
Given that, you might add a 300 amp 400 Hz screen room line filter at your main power panel where you connect up your copper conduit. Once you filter it there, it will clean everything up. Those filters are really effective and mondo expensive.
