I need to get wifi out into a guest house and a metal shop, I have an old satellite dish that I could use for the shop but I only get about a bar outside the shop so I'm not sure if that would help much, and I still need something for the guest house. How close to the Router does an external antennae need to be? Could a cable be run from a directional antennae on the side of the main house 30 feet to where the routers at? Also any recommendations for a router and directional antennae that would work well for that?