Storm Racing Drone and Skyzone goggles - terrible range

i have a Storm Racing Drone (Naza V2 GPS - http://www.helipal.com/storm-racing-drone-gps-rtf-naza-v2.html) and the latest model skyzone FPV goggles. I am able to get them to "pair" easily enough (goggles clearly show camera view) - but I am only getting about 50 metres range. I have stock antennas on both the drone and the goggles but from what I understand should be getting at least 200m...

I am a total newbie and don't know how to troubleshoot this issue or what to try next. Any advice would be greatly appreciated.