If you're not familiar with it, check out LoRa and LoRaWAN for long range, low bandwidth wireless communications. LoRa can be used in many configurations and is simple enough to implement with minimal resources. There are LoRa/LoRaWAN mesh network devices out there that can reach some very significant distances for wireless communications. But, for as good as it is, it does have limitations and alternative methods should always be explored. https://www.thethingsnetwork.org/docs/lorawan/what-is-lorawan/ BTW, did you know you can take a relatively high power audio amplifier and turn it into a transmitter/receiver that uses the soil as its transmission medium? Take the negative end of a single channel audio power amplifier of at least 100 Watts nominal output and tie it to the metal pipe work for water or sewage. Take the positive end of the output and tie it to an earth ground rod or plate buried as deep as you can get it to be. Signals outputted by this arrangement can be picked up a pretty good distance away by a similar setup using a sensitive preamplifier also tied to plumbing and an earth rod. It can be a good backup for communications with a mile or so by using just car audio equipment. It's worth looking into.