Richard Clark wrote:
"Capture area of antennas, 899, 927 of Yerman`s "Electronic and Radio
Engineering"."

"Capture Area" seems useful to show that the maximum energy you can
intercept in a wave is proportional to the product of directive gain and
wavelength squared.

Terman`s examples show that the microwave antenna`s high gain is offset
by the extremely short wavelength.

There is only so much energy in a square meter of passing wave. Large
antennas access more of it than small ones. I don`t often need to make
these calculations.

Richard Clark also says Bailey is "naively assuming a 3 dB gain with
each doubling of elements."

It seems to me that the 2nd, 4th, and 8th element may have the same
flaws as the first. No matter how good or bad they are, if they are all
similar, wouldn`t (n) elements abstract nX the energy in one element?

One of my favorite gems in the newest Kraus "Antennas" is the solved
problem on page 705.
Solution:
(A) The gain of a simple 1/2-wave dipole is 2.15 dBi and of 2 collinear
in-phase dipoles is 3.81 dNi. The array of 8 such collinear dipoles adds
3 +3 = 9 dB. The reflector screen adds 3 dB more and the ground bounce
another 6 dB for a total gain of 3.8 + 9 +3 +6 = 21.8 dBi."

This is the gain of the Deutche Welle antenna which appears on the rear
cover of my copy.

Best regards, Richard Harrison, KB5WZI