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I'm on 10.7, and I want to alter the broadcast power (so my wifi network doesn't extend beyond 10 ft radius or so). Also, if there's a way to change the security to WPA, which windows 7 can do, I'd like to know.

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Your 2 questions are typical security improvment questions. I added the tag security to your original question. Note: the second part of your question has a reply, the first one not yet. Perhaps you should separate the 2 ones to improve efficiency. – daniel Azuelos May 6 '12 at 10:54
10.8 adds WPA to the wifi so that's fixed at least. – nt. Jul 30 '12 at 21:00

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I'm not aware of a good way to modify the radio broadcast power level on the built-in card on a Mac. However, you may find that setting up a shared internet connection using bluetooth achieves your goal of limiting the range.

Regarding your second question, there have been previous inquiries about changing the WiFi encryption protocol on Mac Ad-Hoc networks from WEP with no results.

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