I use real budget stuff, fpv fever Tx/Rx, 7" monitor on an old tripod, 500mAh 3S Tx battery, weighs next to nothing, I think the heaviest airborne part is the gopro AV lead which I dont want to cut because I am tight as a Scotsman....Oh wait a minuty I am a Scotsman.
It works OK but I would rather have goggles over the monitor.
The gear does me for FPV, hasn't failed me yet. It noise varies with relative heading, hope to improve it with cloverleaf/skew Planar anntenna