Back in the early 70's when I lived in NW Indiana WSM 650 AM was off the air which was unusual for them so about at the top of the hour I heard some faint island music and then a station ID and it was KORL from Honolulu. I was able to tape it back then on a old reel to reel tape recorder. Sent a reception report to them and they sent a nice QSL card. The signal was only in for 2 minutes then gone forever then about a hour later WSM returned to the air. On that same cold December morning I logged WDR 1586 from Germany which at that time was my only TA skip. I was fortunate back in those days to log and verify 49 states using a Zenith Transoceanic portable radio with 100 foot longwire and loop antenna.
FM DX would have to be when Mt. St. Helens erupted in May 1980 where I logged and verified a 3000 watt station from White River Junction, Vermont. During the course of 12 hours I heard 18 different states. That was a crazy day and luckily I caught the skip when I lived in Topeka, Kansas.
Steve
http://www.hillcountrynetradio.com