Arthur wrote:
"---to implement this (space diversity) which range from simply coupling
the two antennas together to having entirely separate receivers and just
selscting the best signal."

The latter works. The former doesn`t.

Coupling two antennas together produces a directional array, not space
diversity. The only way to produce space diversity is to selsct a
signal from a group while rejecting the others. With multiple signals,
there is always some combination that can produce complete cancellation.

Best regards, Richard Harrison, KB5WZI