Earlier this year a fellow [befinitiv] started a personal blog that follows the development of his DiY Wi-Fi based FPV video system. It uses a unique Wi-Fi communication mode named wifibroadcast. Rather than repeat what he's written, I suggest starting here:
https://befinitiv.wordpress.com/wifibroadcast-analog-like-transmission-of-live-video-data/
In summary, it is a low cost Hi-Def FPV video system with low latency. Range is expected to be about 1km with upgraded antennas. What is cool is that it uses easy-to-buy components and has simple wiring requirements (connect some cables). It sho