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I was looking through some of my father's ham radio books
recently, and came across something I didn't understand.
/snip/
They assume there's 100% reflection from the ground,
which makes sense, since it's a conductor. When the
radio waves hit the ionosphere, however, they describe
some behavior that I don't understand. Waves that strike
the ionosphere close to normal can be 100% transmitted,
while beyond some critical angle they're partially
transmitted and partially reflected. /snip/