It comes with antennae and cable.Yes need gps antenna, and a cable obviously, plus roof mount system, then also need a poe adapter to 240v, cant get in australia need a europe or usa with adapter, im not powering out of a computer etc, thing be revving its tits off for no reason etc.
Having the antenna and device spilt is way to go, as long as can get decent length cable.
Ant...
Plug an Ethernet cable into the back of your internet WiFi router, plug the other end into the Sparkfun box.
You don't need your PC on at all.