What USB Wifi device with antenna do you guys use?

Hi all,
I live in a concrete house and cannot access my wifi from the kitchen.. My buddy has an alfa with a big antenna and he can use my wifi in the kitchen on Ubuntu, I am just curious are there any cards out there we know work for freebsd that are powerful and can take an external antenna and connect via usb?
I just don't want to buy something that won't work!! So I was hoping for a bit of guidance.

Thanks guys,
 
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