RPSMA connectors were initially introduced to prevent high-gain, professional grade antennas from being connected to commercial grade wireless equipment. Despite this, adapters and RPSMA antennas are both readily available now. Honestly, it wasn't a brilliant idea and it left consumers with a mess. But hey, hindsight's 20/20 right? RPSMA connectors are used mainly on WiFi and other consumer grade wireless equipment. Reverse Polarity SMA connectors have the same outer housing as SMA connectors, but the polarity of the connector is reversed. Male RPSMA connectors have a center sleeve and inside threads whereas female RPSMA connectors sport a center pin and outside threads. The term "Reverse Polarity" refers to this difference in connector polarity, not in any way to the signal polarity.