Jim Lux wrote:
Michael Coslo wrote:

But aside from that little foray, I have no doubt that the effects
that call for diversity antennas/receivers also call for some physical
separation of separate antennas.

Actually, the antennas can be co-located, they just have to have
different patterns. There are some researchers in France who did a lot
of work using an active whip next to an active loop.

A pair of crossed dipoles would probably also work, which would have the
advantage that you could use one of them to transmit with.

Okay, but I'd have to modify (my statement) that as there would have to
be some difference in the antennas, even if co located. Some sort of
difference that would make one antenna receive some particular signal
better than another one. The crossed dipoles are an good example.

As Roy pointed out, it depends on the parameter in question.

- 73 de Mike N3LI -