Hey Brian, thanks for sharing this really informative guide. I live with a few housemates. I have control of the main router and settings. I've setup 2 different wifi connections in an attempt to keep my own connection private and only allow them to connect to the secondary (guest) wifi connection. The setup is working well for me however the wifi coverage is poor in some rooms and I'm looking to use your method to help resolve that issue. My question am I able to use an old wifi modem as a repeater, to ok only repeat the secondary (guest) wifi connection? My old router is not a dual band router so I'm guessing it can't extend both.