2001 XJ8 Wind noise

I have a 2001 XJ8 and have some bizarre wind noise coming in somewhere around the front window post area on both sides of the car. It's a relatively high pitched noise similar to when you blow across the top of a long neck beer or coke bottle (sort of a soft hoot/howl if you will). I have moves the mirrors in a bit and that seems to make no difference so it doesn't appear to be that.

It seems to happen at around 70 mph. Anybody else have a similar experience? Car has less the 40k on it.