I haven't been on the air for a long time but I don't remember any
conversations
as to the upper lobe being used for communication. I always assumed
that
I was using the main lobe. Today I was messing around with some
antenna designs
and I arrived at one where there was only the lower single lobe to the
front
with the upper lobe somehow being removed.
I have no idea what the ommission of any upper lobe would have of any
consequence.
Anybody had experience with this sort of thing?
I suppose that in the early stages of propagation the lower lobe
could make
a connection where as the upper lobe transmission may well be absorbed
by the upper layers that had not yet obtained reflected powers, but
that is
just conjector on my part.
Art