Dan has his TV set up with WiFi about 150' away from his WiFi. How can he improve the connection? Leo says the walls may cause interference. Ben could try setting his WiFi router higher up. But the better option, if possible, is to wire the TV directly to the modem. A mesh router will also help, since it can create a mesh of connectivity, with a separate backchannel. Each Satellite is connected by ethernet. It'll improve it, but it will still deal with interference. He can rewire the home with ethernet. That'll fix things. Also, powerline networking may work as well. In fact, that may be the best solution. Leo recommends TPLink.
Check out this article on how to improve WiFi networking.