Cecil Moore wrote:
Jim - NN7K wrote:

This got me thinking (a dangerous thing when comes
to concepts)! When discussing an Isotropic, as an
object that radiates equally well- in ALL DIRECTIONS,
does this also include all PLANES, as well?


An isotropic antenna in free space radiates equally
in all directions, i.e. in the three physical dimensions.
The locus of points of equal field strength would describe
a sphere in three dimensions.

Thanks, Cecil -- what got me thinking about it was a friend
brought up this discussion of , say Moonbounce , with say
Lefthand circular polarization , as observed from Earth.
(which on reflection should be RIGHT HAND circular polarization
upon return to earth, if to a Linear , Flat plane, like a billboard)
and one of the experts there said to him "NOT so fast about the
signals being 100 % out of phase" ( think had to do with
Faraday effect) - got me wondering about the effects -apparently
NOT a concern with dBi calculations! thanks, Jim NN7K