It local governments take the internet offline, like we have seen in many countries over the past few years using satellite internet connectivity is the best option IMO. IP over radio provides a way for two parties to transmit encrypted data back and forth for some level of privacy, but puts the risk of either transmitting party being triangulated.

Satellites unfortunately are owned by big tech who can censor and shut down connections whenever they want, but while they are working they likely are less prone to local detection if signals are funneled only up. Some reflections might happen in the ionosphere, but tracking that back to a ground location is much harder than a normal radio would be.

I think people should start with getting a basic radio and learning how to talk to people in their inner group of trust; the people you would want to communicate with in the event of a war/disaster/tyranny out of that you can build up your understanding and capabilities.