well..I jacked mine up also, spun the wheel, no noise. Then I took the caliper off and spun the wheel, no noise. I have replace a lot of front bearings in other vehicles and was pretty sure of it being a bearing, you just dont know which one. A straight line noise could be a bearing also but vibration would mean its getting very bad and needs attention now. After I got the bearings off and spun them they were definitely bad. Calipers could be hanging up also and warped the rotor. If it hums or makes noise when you turn mostly, I would bet its a bearing. If you plan on DIY its pretty easy except the strut is in the way on mine and had to loosen it and move it up to get to the front bolts. Make sure you put them back in with the extention on the bearing hub facing rear. There are youtube video's also if you want to look it up.