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Originally Posted by btrayfors  As Eric says, gain is a function of concentration of energy in a given direction. And, over DX paths, it's also a function of the takeoff angle or the vertical angle of radiation. |
I agree, antennas can certainly have gain. However, when it comes to the angle of radiation and DX propagation, let's not call this antenna gain. A well-aimed antenna pattern can reduce path attenuation, but this is not the same thing as antenna gain. It does have the same effect though; the available power is better concentrated in a useful direction.
Bill, I realize that you know this well, but I figured that since we are discussing antenna gain and related misconceptions, we should be extra-careful with the terminology. And in case anyone asks, an antenna does have the same gain transmitting as well as receiving.