Bill Turner wrote:

SNIP



Ask any Top of the Honor Roll DXer whether his beam has "gain". Don't
be surprised if his eyes glaze over as he contemplates what must be the
world's rawest newbie.

--
Bill, W6WRT
QSLs via LoTW


With all due respect Bill I am not a newbie! [see below]

His beam, assuming 100% efficiency, is only 0 dB gain.

Gain [dB] = 10 * Log[Pout/Pin] = 0 dB.

The Honor Roll holder, much to his chagrin, still has a 0 dB gain
antenna. He may have an amplifier that puts out 1500 watts, no feedline
loss and a 100% efficient antenna. He is still radiating 1500 watts and
that is by definition 0 dB gain.

The double integral of ExH across theta from 0 to Pi and Phi from 0 to
Pi is constant in both cases. Therefore 0 dB gain!!!

Deacon Dave, W1MCE [for 50 years]
Program Chief Engineer, USAF MX Missile, RS/RV