I went down the rabbit hole for a while, and gave up when i realized it was a bit over my head to do streaming to the pits. Yes, you can do it. Yes you will need the right licenses to be pumping enough power on the bands you want. No it may not work on all tracks.
You'd need to evaluate each track on it's own to see if it'd work. the advertised range of any transmitter system is always the range over water line of sight, meaning once you try transmitting with buildings, trees, hills, other cars, and who knows what else in the way the range drops a lot. NH would be easier to get working than say NJ or PittRace.
We've had a radio nerd hanging out with us at races recently. Co-worker of my dad's. He comes and manages our radios, records data, etc all because he just likes doing that kind of thing. He's wanted to setup a second radio in the car that's sole purpose was to stream back data and potentially video. If we can get it working, I'll share the details, but I suspect it won't be before next year.
The other way to do it is to just stream to youtube and watch the feed on a 30 second delay, which is what we do now. GoPro hooked into a cervo liveshell which is connected to a mifi hotspot and it pushes the video to youtube. It works, but I'm still dialing in the settings and it honestly depends on the track how well it works.
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