Whistle/whine at specific speed?

Hey guys, one more question for you. When I hit 60mph, I often hear a nearly inaudible, dog whistle type of high pitched whistle/whine coming from the hood area on my car. It’s barely noticeable but crazy annoying once you know.

Has anyone else noticed this and found the source? It doesn’t seem related to rpms, just speed as if something on the front of the pickup resonates with 60mph of air moving past it