KOMA AM 1520 Clear Channel 100 KW with Charlie Tuna from Oklahoma City played rock and roll in the 1960s and covered most of the Western US when it went high power at night. I picked it up occasionally in Viet Nam.
XERF AM 1570 with Wolfman Jack from Ciudad Acuña, Mexico with 250 KW.
XERF in Del Rio Texas was a great station to listen to at night on long trips from Oklahoma to Colorado.
Home of Wolf Man Jack.... see link.
Many heard it on the X.