Interesting one. Now, normally I would agree and say that it's an urban myth but a long time ago in a galaxy far, far away, I worked on ground and airborne radars, civil and military.
One of the guys I was working with claimed he could actually 'hear' radar; well the prf from the transmitter, anyway. We did a few experiments and yes, when close enough, he could detect whether the radar was on or not. He had a theory that there was some sort of rectification going on in his middle ear that was stimulating the nerve endings, giving him the impression of hearing a quiet "chirp". Whatever the true explanation, he did seem fairly unique among us.
So, there *may* be a grain of truth there somewhere. One for Mythbusters?