All I can think of is, that 20 meters is open during both in the day
and at night. During the day, the skip is short enough that very few
stations are in range. Maybe with in 1,500 miles or so. Conditions
in the tropics are so different than conditions in the higher
latitudes, that the band stays open at night, but with much longer
skip, the band stays open.
I hear that from the tropics, conditions are better at the bottom of
the sunspot cycle than we get at the top of the cycle.
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