Comment by iamnothere

If you are ok with the low quality, you could use a radio to transmit fast scan TV to a nearby receiver. Use a repeater if you need to get some real distance.

FPV drones often use this and could be a good source of parts. Or encode the feed and send through a small portable ham radio if you want a challenge. https://irrational.net/2014/03/02/digital-atv/