ok, thank you for your reply's, to address some of it, the location for a camera will mostly be away from most if not all spectators, so hoping that will mitigate some noise.
Radio goes a lot farther than you think it does. That includes the radio noise that you have to overcome. Unless you have something physical to block it, which would also block your own signal, you probably still have to deal with it, even if the world in visible light looks like you're far away.
i hjave had today a lot of luck using a gopro connected by app, then live streamed via rtmp.
thats been only in the house, so my question is, i use a rtmp ip in the van, take camera to where its being used with a phone next to it for the app to run and turn on hotspot, willl this then pick up the available net and stream back to the pc?
Depending on where you or your friends live and what the professional sports teams have done recently (party in the street...), you may or may not remember stories of it taking 3 hours just to get a single text message. Good luck getting *video* through that congested mess!
Your venue might not have *that* many people in it, but it's definitely headed in that direction.
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If you insist on doing it anyway, you can give it a shot, but I would fully expect anything wireless at all, that is accessible to essentially a hobbyist budget, to fall flat on its face, try to work, but never be usable. So you'll just waste your time chasing something that promises to work, but never does for long enough to be worth anything.
If you must use radio in that environment, then you need to use the expensive, purpose-designed gear that requires its own license to use, in which case you probably know enough to not ask about it here. :-)