also depends on where you live if your in a high density area or a large condo building don't worry about it as your being flooded by all sorts of high frequencies from everyone one else anyway. rural areas not as much, but still there is really very few places on this planet now that don't have some radio interference. you could always build a faraday cage and get shielded com wires, I know some one that built a dedicated audio building and shielded the whole building... no cell phone in that room haha.
That said i've used radio wave scanning tech in the military and you'd be shocked at how much we are being hit with on a constant basis.
did I mention our sun.... biggest emitter in the solar system...
Do what you can but don't go nuts over it shielded wires and good placement is all you need.