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I’m new to this too.
But I’ll explain what I know. The STL (studio transmitter link–I think that’s what it stands for) equipment can send a signal over a different spectrum. In this case it is unlicenses and I think part of the Part 15 rules.
So you could set up one of these transmitters at one location, rigged with an omnidirectional antenna, and I belive your range could be about three miles or more.
Then you could set up Hamilton transmitters throughout the footprint of your STL transmitter and rig them with receivers, and cover a large area.
I have not actually done this yet–only have discussed it with others. You might want to contact Keith Hamilton at Hamilton transmitters for additional information. He is very helpful.
Here’s a link to the STL equipment:
If anyone know of better or cheaper equipment, please let me know.