As a prominent professional antenna designer once told me:
"The best antenna that I can build is not going to work very well if you
install it at the bottom of an elevator shaft."
73, Mike NM7X
You could also claim that an antenna low to the ground, or close to
other objects, so that the RF field generates a lot of heat in the
ground or the other nearby objects, is just as efficient as a similar
antenna in free space, because the heat is not due to antenna losses,
but rather due to what happens to the energy AFTER that antenna radiates
it efficiently as an RF field. In this case the installation as a whole
is inefficient, even if the antenna is not where the inefficiency lies.
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