From Dave G3YMC

2. Propagation. Mike Dennison says that the Greek RTTY is weak or inaudible during the day. This was the case here during the summer, but now winter is approaching it is copyable throughout the day, often at very good signals. It seems to get stronger from mid afternoon onwards, but is never less than S7 at any time (and of course way over S9 at night). It is currently (Saturday 1500) s8 and perfectly readable through the thunder crashes.

Agreed.

Mike says there is little groundwave at HF - yes, but propagation seems to be quite similar to top band propagation, where there is most definitely both ground and sky wave. On Top Band during the winter it is quite common to start hearing eastern Europeans from around 1500z in the winter, with some days signals being much stronger that others. The patterns I am seeing on 136 follow very much the same pattern as that band, and the experiences with CFH earlier in the year (with its very rapid fade after sunrise) seem to further support this view. On this basis the optimum time for transatlantic propogation will be at dawn (0600-0800) in December and January.

True, but Andre suggests that EU broadcasters come in best at US sunset
(our midnight).
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Mike, G3XDV
IO91VT
http://www.dennison.demon.co.uk/activity.htm