You need to read up on it. It does have it's uses and I know hams that use
it. Usually by Satellite guys that talk to mobiles too. It gets used by
quite a few commercial broadcast FM stations. The theory is that a mobile
antenna will hear either the main path or reflected path but to a lesser
extent, both so multi-path distortion is minimized. Typically the
reflection cause a reversal of polarization. There is no substitute for
talking to the far station in whatever polarity is agreed on.