You know how some of our own real world crackpots wear tinfoil hats, either makeshift, or real hats with a tinfoil layer inside?
If they used a regular mesh of wire instead of foil, they would stop hearing things that aren't there.
Except that what they hear is not the greys trying to brainwash you into obeying the illuminati or whatever it is that conspiracy theorists are claiming these days. Humans can "hear" electromagnetic radiation, though it is on the microwave range rather than regular radio. I present you the Frey Effect.
Of course, you won't hear your router talking to your cell phone this way. You're more likely to experience the Frey effect if you work with radar, or with radio masts.
And the quote about how wire mesh blocks it:
In 1962, Allan H. Frey discovered that the microwave auditory effect, i.e., the reception of the induced sounds by radio-frequency electromagnetic signals heard as clicks and buzzes, can be blocked by a patch of wire mesh (rather than foil) placed above the temporal lobe.
Now of course, in the real world, we only hear noise. But now that you know this, it doesn't take a lot of handwaving nor suspension of disbelief to come up with a fictional way to enhance our natural capacity to hear electromagnetic radiation.
I don't know, maybe a mutation causes iron or tin to accumulate in high(er) contentration in human bones. This could cause the cranium (where the brain is located) to act like a resonance chamber, amplifying the signal and making it much louder and perceptible for those who have the gene. These people would be able to tell the best spots to place a wi-fi router in their home, by ear!
A little more handwaving and you can change the "audible" spectrum from microwave to regular AM/FM radio. That would be really cool too!