I like disagreements and contra opinions because they can be very fertile thinking grounds provided they are discussed rationally with an end purpose
There is no argument from me that the average domestic situation can contain all sorts of undesirable 'radiations' like wi-fi, mobile phone signals, cordless phones and mains borne crap from central heatng and washing machines, etc., but the average wi-fi system operates at milliwatt levels, so too does cordless phones and my thinking says they would have to be many hundreds of times stronger to actually energise a mains cable with 240 volts AC already residing there. I do get buzzing noises from the hi-fi if I leave my mobile phone on the rack, but still sceptical that the mains lead is the entry point of that interference.
As for mains borne noise from washing machines and such-like, I fail to see how three straight lengths of wire can actively eradicate that.