You need a phone, a LoRa module (Lilygo 2.1 for frequency in your country) and some time and patience. But most importantly - you need peers around you to communicate with. So I would actually start by going to a Bitcoin meetup or some local hackerspace, check what people are interested in, check who you see from your roof and build the network with them. Also - your radio antenna probably won’t do, you need a specific antenna for a specific frequency. It is not plug-and-play and will have little usability if you are doing it alone. Start here:

Getting Started Fast - Reticulum Network Stack 1.1.0 documentation

Communications Hardware - Reticulum Network Stack 1.1.0 documentation