Hello the wifi at my house is 5ghz (NETWORK_5GEXT). I am wondering if I connected a ethernet cable to the wifi extender that I use and my computer will it be able to find the 5ghz network.
Your WIFI extender is all that would find the 5Ghz network. Your PC connected via a cable will not know that it isn't directly connected to the router. It won't see any WIFI network.
Your WIFI extender is all that would find the 5Ghz network. Your PC connected via a cable will not know that it isn't directly connected to the router. It won't see any WIFI network.