Yeah, with mine it was a humming noise at about 40-60mph, any higher and it went away again. The 12/6 oclock method is the normal test, but on my car there was no movement, even so the bearing was in a terrible state. Try rocking the wheel from a few different positions.
You could also run the car with the wheels off the ground, but be sure it is securely supported and the front wheels are chocked! Dont want it running away on you!