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Is the "basement" network your own wifi network, or does it belong to someone else?
If it is your network (or you have your own, but don't remember the name) I can help you log into the router to look up the network name and password.
If it's not your network, and worked before, it is quite possible the network's owner realized others were using it and has now secured the network or changed the password.
Forget it everything just recovered.