This post is really for Loopnode.

At night, I can turn on the radio in my vehicle and pick up AM radio stations from as far away as Chicago. Tonight I was driving through South Carolina and listening to 650 WSM which is the "blowtorch" country station out of Nashville. I tired of that and switched over to a station from Chicago where the big topic was a traffic jam on lakeshore due to a U2 concert getting over.

Skipping is a phenomena unique to AM in the broadcast radio world.