During summer time I monitor FM-band very intensively! It is possible to hear radio stations from 1000 - 3500 km distance on FM-band 87.5 -108 MHz via ionosphere (photo beside)!
Last sumer there were excellent conditions on FM to Europe. I identified hundreds of stations from all around (My distance-record last summer was Radio Darom from Beerseba, Israel on 95.8 MHz, 5 kW, 3380 km. I have QSL).
However, I heard also a few pirate stations on FM via ionosphere - from London, Holland and Serbia.
Here are some audio-clips of these pirate stations which I identified last summer on FM (Many of these stations are indentified or tracked of the given telephone-numbers on commercials):
FM-Pirates from London, UK
87.5 MHz - Platinum FM, London - 14.6.2010 at 15.05 utc // mp3
90.4 MHz - Whoa FM, London - 1.6.2010 at 20.38 utc // mp3
92.2 MHz - MetroLove, London - 1.6.2010 at 20.30 utc // mp3
94.6 MHz - Kool FM, London - 1.6.2010 at 19.43 utc // mp3
See Kool FM studio live-video from their web
FM-Pirates from Belgrade, Serbia
87.5 MHz - Narodni Radio, Beograd - 18.7.2010 at 12.51 utc / mp3
92.2 MHz - Radio Raka Esinger, Lazarevac-city - 15.6.2010 at 09.10 utc // mp3
99.5 MHz - Radio Balkan, Beograd - 18.7.2010 at 12.02 utc // mp3
104.2 MHz - Radio Krajina, Beograd - 7.6.2010 at 15.37 utc // mp3
FM-Pirate from Holland
87.5 MHz - Zender Starsky, Vroompshoop - 1.8.2010 at 12.30 utc // mp3
I tuned this Dutch pirate only about 1,5 minutes time on 87.5 with nonstop music, but I was in contact with this pirate and they confirmed my clip (you can hear vinyl-record slow-starting sound in my clip). They sent a few photos of their equipment, too. Power 2 kW + antenna gain to 4-element yagi.