Basic Circular Polarized Antenna Set RP-SMA

Both Transmitter (TX) and Receiver (RX) circular polarized antenna come with RP-SMA (no pin) connector.

Circular polarized antennas offer substantially increased performance from your video transmitter/receiver by reducing multipath interfence from cross polarized RF signals. That's engineer talk for "It just works better" for best performance use a CP antenna on both the transmitter in the aircraft (ideally pointing straight down) and another on the video receiver. Be sure to check the polarity of your existing linear antennas to make sure you are buying the right ones. You can also purchase adapters to convert SMA to RP-SMA connectors and vice versa to adapt to your needs.