TL;DR
LoRa radio communication devices are becoming popular for extending the range of Raspberry Pi projects beyond typical Wi-Fi limits. LoRa (Long Range) is a low-power, long-range radio technology ideal for Internet of Things (IoT) applications, capable of transmitting small amounts of data with a range of up to 15 kilometers in rural areas. It operates in the ISM (Industrial, Scientific, and Medical) bands, allowing anyone to broadcast without a license, but local regulations on frequency and power must be followed.