What's the hollowing/whistling sound in the dash while driving on highway? on 2005 Ford Explorer

And is it expensive to have fix? I'm a woman and don't want to be taken for all of my change.

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1 answer 2 comments
Need more info. It could be the seal around the windshield glass needs repaired or a gap in the insulation.
where exactly middle or which corner
It sounds like it is coming through the vents and radio area