I'm not sure whether this issue has been raised before or not. I'm very active on VHF, and one of the things you want to keep track of
(if it can be determined) is propagation mode, many possible modes exist depending on band:
MS = Meteor Scatter
ES = Sporadic E
F2 = We all know that one!
RS = Rain Scatter
AS = Airplane Scatter
AU = Aurora
EME = Earth-Moon-Earth aka Moonbounce
FAI = I've forgotten what it stands for (only usable in low latitudes)
And probably some more.