Richard Clark wrote:
On Tue, 26 Apr 2005 21:09:07 -0700, Roy Lewallen
wrote:


I believe "takeoff angle" is in the same category as "capture area" and
"S-unit" -- terms which nobody except amateurs seem to need.


Hmmm,

Capture area of antennas, 899, 927 of Terman's "Electronic and Radio
Engineering. The 899 reference appeals to aperture. The 927
reference gives a value of 1.5 or 0.12 lambda² (also called intercept
area or antenna cross section) for a common dipole.
. . .

I stand corrected. Spurred by your response to do a more exhaustive
search, I found "capture area" in the indices of 3 out of the 12 antenna
texts and handbooks I have, plus in Terman's _Radio Engineering_. While
aperture is more commonly used (judging by this sample), "capture area"
is indeed in use outside the amateur community.

Think I'm likely to find "S-Unit" if I look hard enough?

Roy Lewallen, W7EL