That looks like a rig that might be used in film production, a remote monitor. Just about all cameras used in production these days are monitored live by the director. This is a relatively recent change, if you consider the history of filmmaking, which 30+ years ago was entirely film and required an optical "video tap" on the viewfinder to provide live monitoring. Now that's standard, and there's a monitor setup (often termed "Video Village") where the rest of the crew can see what they got. The problem with a portable rig like the one in the shot is there's no cables, so a high reliablilty wireless rig is required. Nothing really new there, wireless video has been used in production for years, but they've clearly upped their game.
And..."there are no laws on the ground" is absolutely NOT true. All RF emissions are under extensive rules and regulations in the USA by the FCC. There is a class of unlicensed devices that emit RF, with a growing number devices in that category, but "unlicensed" doesn't mean "unregulated", far from it. CRF 47, Chapter 1, Subchapter A, Parts 15 covers every RF emitting device, intentional and unintentional, with Part 18 covering Industrital, Scientific and Medical equipment specifically. Devices in both parts must meet certification through testing. Yeah, it's not perfect, and there are huge problems in the unintentional category, but interference is one thing the FCC takes very seriously, and still does investigate. An industrial RF device, like that in the picture, definitely has passed certification.
