e range of a Wi-Fi computer network depends primarily on the number and type of wireless access points (including wireless routers) used to build it.
A traditional home network having one wireless router can cover a single-family dwelling but often not much more. Business networks with grids of access points can cover large office buildings. And wireless hotspots spanning several square miles (kilometers) have been built in some cities. The cost to build and maintain these networks increases significantly as the range increases, of course.