Just got back from one of my night missions, and I was flying with 2 DJI batters at a time. I also used my celltower, so I could test the range and fly from inside the truck. All went great. I think 30 minuets may be duabull .
And my celltower is unbeatable. I have never been able to get past 5000ft range around here. I was able to go 11000ft with out a single drop in signal. With the 2 DJI battery's I was at 86% and could go much farther. This is in a hi population area so I did not push it. That is why I was flying at 3am, no one to fall on.
Also a lot of humidity,it sprinkle a little when I was out there.
I think my cell tower rig is better then any antenna on the market. It just stays locked on.
Of cores it is made from panels you can get from amazon, and Max.