Radio World has this rare glimpse into what it's like to DX in various parts of the world - with a focus on FM, which is the harder band to get some great catches. But when conditions (called "double hop") are right, the results can be absolutely amazing, as some of us who've been in the right place on the right day can attest.

I remember one day when I was getting Kentucky, Alabama, Florida and more on an afternoon opening like no other. It was amazing. 

The linked article looks at what people who live in other parts of the world have pulled in over the years, including people in New York, Hawaii, Ireland and one guy in Russia who managed to get a station from China. 

It's long and it's technical, but if you're into this stuff, you'll probably find it fascinating.  

Double-Hop Dreams and the Mystery of Long-Distance FM