A highly fragile, expensive, yet indispensable piece of equipment necessary for connecting a PCMCIA wireless network card to a proper antenna. It is a very thin (~2mm), approximately 20cm cable that can still transmit the 2.4GHz signal without much loss, with a tiny plug (usually a 'lucent' type connector) on one end, and a comparably huge BNC-N plug on the other. Comes in various flavours, though, depending on your needs. Usually around $20-30.