I bought these antennas on ebay and they come with antenna wires to connect to the wireless card.
I've seen those little devices before but didnt' want yet another device to plug in. Also, I haven't had any issues so far with Connectify. But I did change my wireless card mode to b/n and do not allow "a" 5ghz wireless. 2.4Ghz has better range and is more stable at the cost of slower speed which doesn't really matter for me out in the field where I will use the NUC.