@Jacko What’s your level of soldering expertise? Based on arduSimple’s site you aren’t supposed to use the 1W XLR radio so that limits your range but I think the LR will still probably work for your 2km, I was able to go 12+ km with my XLR base and LR rover. Either route you go, you might be able to get the bare Digi radio from a site like Mouser and program it yourself for a lot less.