A VHF radio, narrowband with high output power will have a lot better range than 2.45 GHz . You may consider to avoid the repeaters. Our experience from metering systems is that repeaters are nice in theory by a mess in the field… where to install, permissions to sites, who pay the powre if mains connected…. This is the reason 169 MHz is having a major success – no repeaters needed.
Last Update: August 8, 2017