One of my favourite low cost hobby bit suppliers have a special offer on for a small foldable drone with a tiny 1080p FPV camera which transmits to your phone. It looks like a very cheap and descreet way of adding FPV to your tank £26 odd for the black 1080p single battery option. Needs one more buyer! I've just splashed for one. Use the link below if you'd like to join in
So far I've made several videos about fpv and I put it in several different vehicles, and I never spent more than that, and it will broadcast to my TX or my dedicated receiver on 5.8. I'm not sure what they're using for the fpv that goes to your phone, but I doubt it's 5.8 quality.
When FDR coined the phrase "The Arsenal of Democracy", he was talking about Detroit. Proud to live in the 2nd most violent city in America!!
Also depends on what quality of image/resolution you want...
One of my favorite FPV Cameras is a dirt cheap one off of Hobbyking (https://hobbyking.com/en_us/quanum-fpvm ... tenna.html) Connect to your receiver via an extension and Velcro to a tank = Instant FPV Camera. Video is not high def, but still easily usable for FPV and ground range is fine for IR Battling.