On Fri, 22 Sep 2006 03:32:13 -0700, Roy Lewallen
wrote:

"efficiency" of the best HF antenna is better than
0.001% by this criterion.

Hi Roy,

Not far off.

If absolutely EVERYONE (presuming 6 billion of us) on the planet got
art's signal at S9 from a 100W transmission, that would only be 300 mW
captured (0.3% efficient).

I suppose the 99.7W lost would contribute to Intergalactic Warming
(which would be 99.7% efficient). However, HF temperature is for all
practicable purposes indistinguishable from absolute Zero.

73's
Richard Clark, KB7QHC