Diversity antennas help overcome a phenomenon known as multi-path, where a transmitted signal bounces off obstructions and arrives at the receiver at slightly different times. An AP with two antennas operating in diversity mode will nearly always deliver more reliable service (and sometimes higher throughput) than an AP with just one antenna. Antenna and radio quality does vary, so you can't just assume that a single-antenna AP from vendor X will under-perform a dual-antenna AP from vendor Y. On the other hand, only the most entry-level APs have one non-removable antenna, so you will usually be better off buying an AP with antenna diversity.
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