MacBook Pro can't see and connect to WiFi but adjacent MacBook can

My wife and daughter both have MacBooks and can see a lot more local WiFi networks that I can on my MacBook Pro. In fact I'm using my wife's MacBook to post this topic since I can't get online with my MacBook Pro. I've compared the settings between the computers and can't see a difference. Could it be that the MacBook Pro has a "weaker" AirPort card in it or is there something I've done?
Thanks.

Yes and no.
The MacBook Pro's case is metal where the cases of the MacBooks are polycarbonate.
Since metal attenuates RF frequencies, MacBook Pros (and before then PowerBooks) have always had slightly worse AirPort performance than MacBooks (and before that iBooks.)
However the difference should not be so great as to prevent you from getting onto your local network unless it's a very weak signal to begin with.

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        1 2.9 GHz Intel Core i7 CPU: 2-core
        8 GB RAM Upgradeable
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        TOSHIBA MK7559GSXF disk0 : (750.16 GB)
            EFI (disk0s1) <not mounted> : 210 MB
            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
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        FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
        Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
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        369 MB    BitdefenderVirusScanner
        206 MB    iPhoto
        180 MB    Finder
        163 MB    WindowServer
        160 MB    softwareupdated
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        376 MB    Free RAM
        4.13 GB    Active RAM
        2.77 GB    Inactive RAM
        1.12 GB    Wired RAM
        95.19 GB    Page-ins
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        Mar 6, 2015, 07:10:16 PM    /Library/Logs/DiagnosticReports/SymDaemon_2015-03-06-191016_[redacted].crash
        Mar 6, 2015, 01:15:00 PM    /Library/Logs/DiagnosticReports/BitdefenderVirusScanner_2015-03-06-131500_[reda cted].cpu_resource.diag [Click for details]
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