This sounds very much like the requirement faced by GPS receivers, so
you might also try some forums dealing with that technology. To my
knowledge, patch and quadrifilar helix antennas seem to be the most
commonly used.

Roy Lewallen, W7EL

Jerry Martes wrote:
I have become interested in trying to develop antennas for hemispheric
coverage for circularly polarized signals. My interest in related to 137
MHz weather satellites, but not restricted to that frequency.
I have one concept for receiving NOAA satellite signals that is slightly
better than with a Quad Helix.

My reason for this post is to try to communicate with anyone with interest
in this antenna development as a hobby. That is - I'd like to be able to
exchange ideas with another amateur antenna hobbyist.

Jerry