Allodoxaphobia wrote:


Incidentally, while you can extract only half the power from a wave with
a perfectly efficient antenna, it is possible to extract *all* the power
from a wave. An anechoic chamber extracts essentially all the power from
waves generated within it.


As well, the universe, in all it's vastness, eventually "...extracts
essentially all the power from waves generated..." by _any_ source. HI!HI!


No it doesn't. Free space can't extract any energy whatsoever from EM
waves travelling through it. Consider :-
The cosmic microwave background hasn't had it's power extracted by
the universe in all the time since the big bang. Conservation of
energy applies everywhere.

Just my opinion ;-) but it's allodoxOphobia.

best

Andy