The screenshot above is from 50 Mhz today (23rd May 2011). No WSPR stations heard but you can see the lines above about 5Hz apart. At first, they might just look like some sort of computer interference but these are actually TV carriers. The band was open to Eastern Europe and the TV transmitter was probably located somewhere there. Looking at the DX-Cluster and listening down lower in the band, then it was certainly open to Poland and the Czech Republic at the time.
It also shows the limitations of WSPR on VHF.....band was open yet no WSPR stations heard. Outside of Western Europe and the USA, there is certainly a lack of activity from other areas.
