Orinoco 11a/b/g PCI Gold

Hello all I am new here. I have acquired the above card from ebay for £1.00 although I had to pay £4.00 postage I knew that it did not have an antenna, but thought I would be able to get one, that is why I am here can someone tell me something about this wireless card and where I could purchase an antenna for it and how much it would cost, a link would be appreciated. Normally in wireless cards the antenna connects directly onto the back of the pci card why is this one different it has a lead with a connection for an antenna on the end of it.