MacBook Pro wireless problem

The airport card in my older MacBook Pro went out. Is there a USB wireless adapter specially made for Macs? I've been striking out at Fry's Electronics. Thank you.

I am having the exact same problem with my MacBook and Airport Extreme. It seemed that once I downloaded the latest firmware 7.4.2, I am getting connectivity issues to the Airport. I have a strong signal, but the base station disappears often, even when the laptop is sitting right next to. Signal strength is good throughout the house, but connectivity to internet is spotty at best. My iPhone can connect to the Airport with no issues and is able to connect to the internet.
I did a factory hard reset and went back to the 7.4.1 firmware, but still am having same issues. Sometimes I have great connectivity, but more often then not, I am getting nothing. My MacBook appears to be able to connect to other wireless networks, i.e. the one in the Apple Store. But I haven't been able to confirm if any other computers can connect continually to the Airport. I have perfect internet connection through the ethernet ports on the Airport. Interference might be contributing, but shouldn't have any issue with the laptop sitting right next to the base.
Is there anyway to run diagnostics on the wireless card or the base? I did the PRAM reset, but nothing changed. I am glad I am not the only one who is now experiencing this. Very frustrating because a week ago, I was working great and have been for over a year and half.
Looking for any other bright ideas on how to troubleshoot.

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    Is there anyway to run diagnostics on the wireless card or the base? I did the PRAM reset, but nothing changed. I am glad I am not the only one who is now experiencing this. Very frustrating because a week ago, I was working great and have been for over a year and half.
    Looking for any other bright ideas on how to troubleshoot.

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