Ffs, I apparently haven't been keeping up with my favorite artists, because this one completely passed me by.
First off, while I'm not against long tones, the one you used was just loud enough to be annoying, and the frequency was JUST barely enough to bug me. Replace it with a soothing saw, and you'd have a perfect track!
That said, this is a very good track! The tone does create an unsettling atmosphere. I really like it :D