Within a couple of hours of unpacking this radio and without an external antenna, I was able to hear and identify five AM stations that were each over 500 miles away from my home here in Mesa Arizona: 1 in Salt Lake City, 505 miles; 1 in Denver, 577 miles; 2 in San Francisco, 666 miles; and 1 in San Antonio, 831 miles. I should point out that this was in the evening, when radio signals travel best.