Buy a directional antenna Find the highest point you can possibly get to Install antenna up there Or Install the tallest flagpole you can in your area Make sure you have damn near perfect line-of-sight to your other node When you start to desire these types of distances, all you need is *extreme* height and a 100% signal focused to a direct line-of-sight connection. This is where it gets hard.

These tall flag poles are hella expensive too. Like $15k+ easy

How would I know I have line of site 50 miles?