Omni-directional antennas tend to pick up equally poorly in all directions. They are rarely effective beyond 25 miles and are useless if you're in a multi-path environment.
Use either the A-B switch or a rotor for best results.
Directional antennas that are at right angles to each other are sometimes more likely to be successfully combined using a simple reversed splitter. It will take some trial and error to see if you can avoid multi-path or phase cancellation problems along with the additional insertion loss of the splitter.
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