But speaking in term of HF and microwaves, Arecibo and DSN remains the
largest.
All depend on what frequency bands are concerned.

Thierry, ON4SKY

If you want to go way up the spectrum, the Hale Telescope
http://www.astro.caltech.edu/palomar...es/cutaway.jpg
on Mount Wilson is a single-unit steerable antenna of sorts. Also may have
the honor of being the best-illustrated project. Russell Porter was an
artist with a drafting board.

cheers-

Dan
A.R.S. NK7H
currently off the air until I clear off my t-shooting bench and find those
blown transistors....