Buck wrote:
What is the gain of a dipole over an imaginary isotropic antenna? I
believe I read 7.x somewhere. Whatever it was, it was greater than
anything I expected.

In *free space* the gain of a dipole over isotropic is about 2.14 dB.
Over ground, the reflections from the ground add another few dB.
dBi is *always* referenced to free space. An isotropic over perfect
ground would probably have a gain of about 3 dBi assuming no destructive
interference. A dipole over perfect ground has a gain of about 7.5 dBi.
Rule of thumb: A dipole over average ground has a gain of about 6 dBi.
--
73, Cecil http://www.qsl.net/w5dxp


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