Car has a loud vibration coming from driver side when between 25-60 mph. on 1997 Mercury Sable

Been to Dealer for diagnosis. Unsuccessful. Car is quiet in town under 35 mph, and at high speed when turning LEFT on freeway. No clunks or clicking. sounds like a plane. We're thinking wheel bearing? Sound does not go away when put in neutral at high speed.

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2 answers 1 comment
agree with 1&2
Definitely sounds like a wheel bearing. Probably the driver's side front bearing. Dealer may not have taken it for a test drive and thus, did not discover the problem that would only show under those circumstances.
I agree with #1 but you have to be careful when diag wheel bearings because a lot of times it sounds like the left side but it is the right side