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DroneBridge
DroneBridge is a system based on the WifiBroadcast approach. A bidirectional digital radio link between two endpoints is established using standard WiFi hardware and a custom protocol. DroneBridge is optimized for use in UAV applications and is a complete system. It is intended be a real alternative to other similar systems, such as DJI Lightbridge or OcuSync.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I would try to make something up of ESP32 LoRa boards. They can do amazing long ranges and are super cheap. Also support p2p networks so you can place transmitters anywhere. Using LoraWAN and DroneBridge would work I guess but I don't know about the latency