My iMac will not display my wireless networks, any suggestions?

I have 3 wireless netowrks in my house. My iMac will only display the one that is for my home automation system and it is not connected to the internet.  Any suggestions on this?  When I click the wireless icon at the top it only shows 1 network, it won't display my other network or my neighbours networks.  When I try to add one of the other networks in my house, it will not find them.

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