I spent half an hour this evening listening to 700 khz on my Eton E5. "ESPN radio" was announced several times, and the broadcast included sports headlines and football highlights. The radio show was identified as "GameNight". A stronger spanish signal faded in just before the top of the hour, so I thought my chance to identify this station was gone.
ESPN radio has a page of affiliate radio stations that can be filtered based on shows. I set the filter to GameNight, and found only one affiliate on 700 khz: KXLX in Spokane, Washington. Their nighttime power is 600 watts, and the station is about 800 miles away from me.