Use your own thread to ask for assistance on your question.
Be prepared to answer why you are requesting this personal service .
I asked a question on this thread with respect to the main advantage
for hams that linear
polarization has over CP. I have no resistance to change if it can be
justified. I see
that it can pick up signals that linear antennas cannot hear because
of a 30 db attenuation
where as CP has only a 3 db attenuation!
So what is it on the other side of the coin is what this thread is
posing to those who are familiar with respect to radiators.

Cross polarization can be used to provide isolation for duplex links or
co-channel sharing.


I think that you are looking at it from the wrong point of view. CP does not
have 3dB attenuation, but a linearly polarized signal received on a CP
antenna will be 3db down (whether that be H, V or slant).

So for amateur use CP is useful in that with another CP station multipath
due to reflections will be reduced (reflections taking on the opposite hand
CP and thus attenuated). However, if a CP antenna is used to receive H or V
you may well not see the full 3dB reduction due to twisting of the
polarization on the path. In fact over some paths the signal on a CP antenna
will be better than on a linearly polarized antenna due the a greater
attenuation due to polarization twisting.

Of course the best of both worlds is to have a crossed yagi with a phase
switching box so that you can select CP (both hands) H, V or slant 45 both
ways.

Commercially (terrestrially) I don't think that CP is used much except
perhaps on microwave point to point links.

Jeff