CivilPenny

Well, my friend and I replaced both front wheel bearings and did an oil change while under the car. The reason I replaced them was due to a "woahwoahwoahwoah"(say it really fast) sound while driving. It is pretty loud, so it NEEDS to be fixed. It is constant from low to high speeds and gets worse as speed picks up obviously. While swerving in and out, we noticed when swerving left the sound reduces, while going straight and swerving right the sound continues.
My suspicion now is maybe the tires are out of balance, or even going bad (discount tire said the fronts are good but rears should be replaced soon due to low tread). Possibly rear wheel bearings?
It sounds like it is coming from the front, however, my friend said possibly even the middle. Hopefully nothing in the drive train...Any ideas before I take it in would be appreciated. Thanks guys