Hi! Im very interested on this project, because it is my main preference of electronic design.
I'm electronic engineer, with several experience on circuit design and particulary advocate to RF circuits.
My last project done was an RF transceiver with LoRa.
I can offer to you, make a transmitter with a LoRa module, the range can vary the model, but they are all Low Powered, long range transmission and lightweight.
Then we can control the information with a MCU of preference.
Please contact me to discuss further!
Yamil Simes - Electronic Designs