I ordered this receiver and found online that it works on RPI… works as a webcam then, but wireless
there is a lot of this material , I’m not a drone pilot So I don’t know what’s good or bad…its a gamble 
transmitters - https://www.banggood.com/search/fpv-transmitter-600mw.html?sbc=1
cameras - https://www.banggood.com/search/fpv-cameras.html?sbc=1
for the Tx side I ordered this video pal camera + 5.8 transmitter
