The idea is to just create a fence around your yard so the earths curvature or topography shouldn't matter, Although if your "yard" is like 80 acres I suppose t

The idea is to just create a fence around your yard so the earths curvature or topography shouldn't matter, Although if your "yard" is like 80 acres I suppose that would be an issue... however if you have 80 acres of property, you might consider hiring someone LOL