The best bang for the buck is the DBS panel antennae , $100. That will give you around a mile. I added 2.4 dipole bird side antennas and getting over a 1.5 miles. They are $60.
I purchased these on ebay.
http://www.ebay.com/itm/151588972754?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
For $12.50 they seem to work well and they are reuseable.
I had the same issue today. After taking several Raw Photos about 1000 ft away the camera went dark and I could not get it back without landing and restarting. I'm using moto turbo. I tried the DJI app and it also was dark.
I just returned from Houston on Southwest and had no problems. The guys with TSA said they are seeing more and more quads. They didn't even want me to open the case. It fit easily in the 737 over head space. If you check it is recommenced to carry the batteries on. You have a unlimited amount of...