When it comes to network, I always recommend to find local professional company that sell, install, support and solve questions like that. Not a hobby guy, not a friend, find a pro. Pangolin use standard network protocols, and there is huge palette of network equipment. There is wireless network bridges with 2 Gigabit speed, and less than 1ms lag, and 20Km distance. Point is - find professional who can take care and guarantee results. And - take into account, WIFI is not what you are looking for. Plus, make sure that this is legal in your country. Many countries has regulations for using air, and lasers.