LoRa Unlicensed Band

 https://makersportal.com/blog/2019/10/5/arduino-lora-network

https://www.digikey.com/en/articles/unlicensed-915-mhz-band-fits-many-applications-and-allows-higher-transmit-power
"FCC regulations for the 915-MHz ISM band, for example, place no restrictions on type of application or duty cycle."