MenaceRC Viper is a directional antenna with high gain and linear polarization. Small rod antennas with linear polarization are mainly used on Whoops and small 2-3" drones. Linear polarization is also used on DJI O3 units.
When combining antennas with circular polarization on the glasses and linear polarization on the copter, there is a 3dB loss, which is equivalent to the video transmitter transmitting at half power. With this antenna, you will avoid these losses and increase the video range.