There are several networks that keep showing up on my airport. How do I delete them?
how do I delete unauthorized networks off my airport?
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The other "unauthorized" networks that you see are simply the signals that are being produced by other wireless routers owned by your neighbors.
You might see anywhere from one or two to a dozen or more depending on where you live and how close other neighbors are located in relation to your home.
The neighbors can "see" the name of your network from their computers as well, so you might want to make sure that you have a good password for your wireless network to keep other uninvited guests from using it.