YKS 5.8GHz Circular Polarized Mushroom Antenna RP-SMA Female Plug RX/TX Set for RC 5.8G Transmitter and Receiver (Straight inner hole) 5.8 GHz Circular Polarized Antenna Set for transmitter and receiver Polarization: RHCP, Right Hand Circular Polarization. Greatly Improved the signal range and covering of your fpv wireless video transmitting and receiving system. The Cloverleaf Antennas enclosed with a plastic protection cover to prevent damage the Cloverleaf shape copper wire. Straight RP-SMA Plug (female plug/ inner hole)