Wow! My problem was simply bad front bearings. What happens when you jack the front end up and wiggle the wheels. These instructions http://connect.timken.com/wheel-bearing-replacement say it might be bad bearings. I wonder if there is something wrong with the wheel/axle itself and checking to see if there is play in the tire may help pinpoint the problem.
The noise you are hearing has to be caused from something related to your axle/front end drive system. Perhaps you should just cut the front end off and call it a day.