This audio sample of VOA Radiogram, 1 June 2013 at 1600-1630 UTC on 17860 kHz, was received by the University of Twente wideband SDR receiver in the Netherlands.

You can hear the fair-at-best signal (S/N ratio of 1 to 12 dB according to Fldigi) and moderate fading. And at about 1:40, a loud pulse-type interference added to the mix. The MFSK32 text transmission at the time was unscathed throughout.