Right on Sparky,
This is exactly the set up idea I was thinking about. Big screen, in my living room controlling my Mavic over extremely far distances. Only I was also wanting to create a cockpit type of controller setup with a variable speed throttle, a separate multifunctional cycle controller and foot pedals for rotational control.
I'm still working on the same issues you're obviously dealing with.
Sometimes the answer to our problems is not the high tech answer, when all else is not doing the trick, go back to basics and experiment "HACKING" with old school stuff. It's worked for me in the past for several projects. I made a 9 volt powered wireless mini spy color camera with sound operate over a distance of over 2500 ft from my house while watching the feed on my TV in the livingroom. I took the antenna off the cameras receiver and put it on a coax line that went to an old satellite dish on the roof. Inline I experimented with a cable booster and "HOLY CHIT" it went from 150 ft range to "I'm freakin a half mile away from my house".
Try something different like when you used to grab free internet from your distant neighbors using a yagi antenna. before they started using security encrypted routers. I'm not saying to use a yagi per se I'm just saying try experimenting with some of your old technology sitting around. Maybe you'll get lucky and come up with an answer for all of us. Hell I'm trying all the time when time allows.
Good thread and keep us posted on this
Thanks
Nick