Topband: 160M Propagation

[Dennis]

I recently operated as CX/W1UE, from Uruguay.  I had difficulty hearing 
stations on most nights,
but the night from 2200Z Thursday Dec 10 to 0600Z Friday Dec 11, I had 
no trouble hearing
stations on either 160 or 80M.  I worked more stations in that 8 hour 
time period that I did in
20 hours spread over 2 weeks.  I keep coming back to the same question- 
why?

Since I have never operated from CX before, I have nothing to evaluate 
the 2 weeks against.
Did that night have exceptional low band propagation?

For that one night, I had no problems hearing anyone, it seemed.  I 
worked as far east as UA9
in Z18 on 80M,  and a dozen Europeans on 160M.  Stations that I never 
heard before or after
that night.  I'm trying to figure out how I heard so well on that night, 
but not on the other 10 nights
where I also tried to make 80/160M QSOs.  I can't explain it.

Dennis CX/W1UE now just W1UE.