What's the easiest way to double the range of your FPV video system? Well you can get a video transmitter that is four times as powerful, or you can get an antenna with 6dB more gain.
This video sets out to explain how "gain" works and why high-gain antennas are best used in conjunction with a diversity controller.
If you have any questions, feel free to ask in the comments and if you found the video useful, please give it a thumbs-up.