If it is a desktop, then replace the antenna on the desktop pci card. If it is a laptop, there will normally be a cover on the bottom to reveal a wifi card. It will have two wires coming out of it. This is where the antennas attach.
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It has two wires, a black one and a white one. I put them bothe into the cantena but nothing realy happened.
ok, a few more details would help.
a) is this a desktop or laptop?
b) did the wires have little metal things at the end?
pictures are extremely helpful too
You can, as long as the built-in wifi has a port, or somewhere you can solder an antenna pigtail wire to connect to the antenna in the cantenna.