There are 3 versions of this series antennas:

Copper square base version 16dBi
Copper round base version 14dBi
Plastic base version 12dBi

* This is NOT a Omnidirectional antenna, it is directional antenna,  so it doesn't suit for onboard A/V transmitter.  It is designed for fixed position/direction transmitting, it can provide higher gain but orientability is also stronger. 

FPV 12dBi 5.8G High Gain Spiral Directional Antenna - Plastic Base ( SMA, jack)

Gain: 12dBi
Antenna connector:  SMA, jack  ( antenna side) Refer to here for connector type diagram
Length: 107mm
Base dimension: 40 x 40mm
Weight: 29g

Includes:
1 x antenna
1 x SMA plug to RP-SMA plug convetor
1 x 18CM SMA plug to RP-SMA plug conversion cable

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