Dave VanHorn wrote:

no. . a beam antenna is more similar to a lens.
lasers have an excited medium, that is made to dump out photons in
sync.

masers do this in the microwave region, but i'm not aware of anything
reaching down anywhere near this far.

Granted, but what is the point of asking such a question. The properties
of radio frequencies below UHF prevent focused beams of energy as
narrow as a maser. Even if there were a way of generating radio waves
in the same fashion as masers, they wouldn't propagate the way maser do
anyway.

--
tax office, n.:
Den of inequity.