I'm currently deployed and using a wifi extender on the roof to pick up our base internet. The extender is plugged into my MBP via USB and picks up a great signal. My roommate wanted internet too so I used internet sharing and gave him a "hotspot" using my airport. Everything works fine but now everybody in reach is trying to get on our little network. Is there a way I can hide it from everyone, but still give him access? Thanks in advance.