We'd be looking at WiFi for this application. It doesn't require a license (within certain limits), should work really well at the range (low interference, unless it rains), and is already present on the phone.
This kind of link -
http://ci-journal.net/index.php/ciej/art...ew/487/402 - requires antennas, and that requires somewhere to plug such a thing into the phone. That may be a hangup, because none of the newer stuff has an external antenna port anymore. I _think_ they're still required to accept them, though, so maybe it's a matter of tearing it down, locating it, and drilling a corresponding hole through the plastic casing.
I discussed the idea of 'WokFi', as in putting the device in a metal enclosure (like a can or stir fry wok) to collect signals for it, but it wouldn't be practical to aim the phone's camera at the target and the collector at the firing line. They aren't likely to line up, but a cable between them fixes that, so we're back to antennas.
The simplest diagram would be like so:
[Android phone:Camera -> Software -> Built in WiFi] -> Antenna -> (Air gap) -> {Antenna -> Laptop or Phone to view the images and/or video}
That {curly bracket} part could be lots of things, like a router instead of an antenna connected to an internal card. But that would add another device that might fail on you in actual use. KISS.
Also if you had cell service you could use that instead of WiFi and you wouldn't need antennas, but I'd say you shouldn't design around that being present. Plus you'd need to add cell service to the receiving end if it was a laptop and not a phone.
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