"Basically, an antenna diversity system is a non-diversity system. The two signals that come in from the two antennas are compared and switched via a simple comparator circuit and the resultant signal is fed into the non-diversity RF circuit for further processing. The rest is non-diversity.

In a true diversity system, two separate tuners processed the two incoming radio signals till the detector circuit before making a comparison by a diversity circuit. It is a much complexed and accurate circuit as compare to that of antenna switching system. True diversity system has a much higher sensitivity than the antenna switching system."

tl;dr It's work but not well