CAPT - Very interesting test carried out and the results you gained with your Typhoon H, I have only carried one test for range myself this was across open farmland with the odd tree in the fields and the distance I achieved 5384 ft approx altitude of 150 ft but I stopped and turned around because any further it would have meant crossing a road it may have been able to go further but for safety reasons I did not, I noted that after turning the H around and heading back to home position after about 75 ft of distance traveled I lost telemetry data then video connection for a couple of seconds as soon as I gained altitude of 200 ft all data back including video connection, now my typhoon H like your is standard everything apart from the firmware was the previous std version.
My question do think some of range problems that are occurring with some users are due to flying in more built up areas where there is more wifi signals.
I noticed on your video there was some buildings behind you which may have been transmitting wifi signals and a few building along your flight path, Whilst I'm trying to understand how I managed a far greater distance than your first part of your test of 3714 ft and originally at lower altitude of 150 ft albeit when I turned to come back I did lose connection briefly until I gained altitude to 200 ft.
The only explanation regarding the range difference I can think of the test when you was not using your egg box, my flight with exception of only one building in sight in any direction and that defiantly was not transmitting any wifi signals, this would maybe explain the difference of your first test of 3714 ft to my 5384 ft, but your egg box trial was truly amazing and achieving 5751 ft distance.