My Rogue makes the same noise. I do have a roof rack, but noticed that when a window was cracked the problem went away. With approximately 80 to 100 MPH of drag on the car (including wind) the car makes a noise from the window. When the window is cracked and the speed is maintained, the noise is eliminated, not drowned out by the noise from the wind, but eliminated. It is almost as if there is a vacuum problem.