About GMRS and licensing: https://midlandusa.com/blogs/blog/why-do-i-need-a-gmrs-license-how-do-i-get-it
https://mcbainsite.co.uk/a-guide-to-dmr/
https://mcbainsite.co.uk/how-to-make-a-dmr-codeplug-tyt/
https://www.arrl.org/band-plan
https://www.arrl.org/rf-exposure-calculator
https://kv5r.com/ham-radio/coax-loss-calculator/
https://n1atp.com/project-dmr/dmr-aprs
https://miklor.com/