CBK is the only station I have heard on both coasts (Seattle and Maryland). Signal is far better in Seattle than MD, but it’s there!
Otherwise, it’d be WSM, which has a listenable skywave signal west of Denver most nights. It’s easily listenable at night from NJ down to Central FL.
WSM used to be audible on the coastal PNW, but CKOM Saskatoon and KSTE Sacramento basically have that channel covered.