Quote Originally Posted by AnyHuman View Post
I'm not very technical when it comes to AM stations, but I thought the waves always transmit through air and not ground. LOL
AM groundwave is conducted via the surface layers of the earth (or bodies of water). AM skywave is bounced off the ionosphere back to earth farther away.

This is right from the FCC: https://www.fcc.gov/media/radio/am-stations-at-night