Thanks to all who replied on the above.
The answer is complex, and I am not going to attempt to summarise here.
The easiest to understand came from Dr Jack Belrose, who has posted a
comment to Antennex.
It can be read at www.antennex.com
click on Forums, Compact Antennas Y2K, "Re Brazillian Field Strength Report
of Tanta CFA Station"
73, Greg, ZS5K
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