Ok, we can customize a solution for you, but probably won't be able to get this out to you for around 3-4 months.
RF and mesh is our domain. We can guarantee NLOS at well over 20 km+.
5KM in not a large distance. Not sure if LoRa can handle 200 nodes or work in the bush --- trees are the enemy of anything above 300 MHz.
I'm all for using HF (below 30MHz) or tactical VHF (30-108 MHz).
Would 1-1.6m antennas work?
I can email you a case study for a much more complex project that we did last December .
We were able to transmit video using 100KHz of bandwidth over a frequency of 30.5 MHz. Our moving car was traveling at 130 km/h and achieved a 64km+ distance from the base station --- we used 50% less bandwidth to transmit video than what an FM radio station uses to transmit tunes and other meta data. Our glass to glass (camera lense to monitor) latency was 24ms.
Our solutions don't require an expensive sattelite link or any phone network to work (although we can add those options).
What this means is that our radios will always work, come rain, come snow, et al. --- Satellite links are easily disrupted by a low cast / clouds , etc.
Our signals reflect and refract of the ground and the ionosphere to give you NLOS in any condition.
So a sensor based project of 200 nodes is no problem at all.
If waiting 3-4 months is not a big deal, then we can donate a few units to your project once we learn more about it.