From Columbus, Ohio, the farthest station I have ever pulled in on any radio is PJB from Bonaire. I believe that was in January 2024 although it might have been earlier. It was the first of so far two times I have ever heard it, and it was about as weak as you could imagine given the distance.
Domestically (or Canada), KOA is my farthest catch from here, but I will add that WBAP is the only station I have personally heard in both Columbus and Las Vegas. I remember it blasting in during a work trip to Vegas about 20 years ago. Guessing WOAI would also fit the bill, but its skywave signal has been awful around here for years, at least on the times I've tuned to 1200.