I own a 2021 Yukon Denali; purchased in February 2021. Just this weekend, 7/17, I have experienced the same noise. To me it sounds like water hitting the upper roof area near the antenna. There was intermittent rain during the duration of my 500 mile trip. Very disappointing for an $85K vehicle. Also very concerning since I owned a 2007 GMC Acadia that had a persistent water drain tube leak into the vehicle for the duration of my ownership.