Hi,
Reverse polarity RP-SMA connectors were introduced to separate professional and commercially available equipment, preventing unintentional or intentional connection of high-gain professional antennas with SMA connectors and commercial wireless equipment with RP-SMA connectors, violating federal or international laws. Today, however, both types of connectors are readily available.
The RP-SMA typing of the coax connectors is confusing because the chassis connector is called female, although it looks “male” with the central pin.
Practically speaking, it does not matter which type of SMA (or RP-SMA) connector you choose. Of course, the rod antenna must be able to be screwed onto the appropriate chassis connector (male/female) so both must be either SMA or RP-SMA type. The specifications must indicate that they are intended for 2.4 GHz Wifi (and the gain 3 dBi or better)
Arylic Rod Antenna > RP-SMA connectors
Left to Right : chassis, rod antenna, u.FL (to PCB) connectors
Greetings