25mw vs 800mw VTX Output with 1250m distance (DVR comparison) TrueRC antenna power

I was flying by mistake one of my last flights with 25mw. The distance was 1.6km or 1 mile out. Its was in the mountains, and I was wondering about the bad OSD reading. After landing I realized I still had 25mw output on my TBS Unify Pro HV.
So I wanted to check. This was not the best RF environment, and I had bushes in the LOS.
The trick is not so much the output. It's much more the Antenna Setup. First the Rx Antenna, and more important for me the tx Antenna. I believe in TrueRC AXii and Xair2.
Both flights are flown with Xfire on 25mw too.
Equipment used:
Frame: www.fpvframe.ch, 7inch Version (Snowman Edition)
Motors: Garilla 2507-1500kv
Battery: 3000mah 5s, or 2200mah 5s
Props: HQ 7045 tri V1
FC: Radix with Hobbywing 4:1 ESC
TBS Unify Pro HV with AXII Antenna extra Long
Crossfire micro Rx with Immortal horizontal mount
Taranis x9d+ with Diamond Antenna and full xfire
Receiver Antenna: TrueRC 5.8GHz X²-AIR Antenna RHCP
GoPro Hero 5 Black

Edited with Adobe Premier CC
Music by Len Sanders

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Please watch: "Epic Long Range FPV Drone flying in the Swiss Alps"
https://www.youtube.com/watch?v=yuLqGqboxo8
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Видео 25mw vs 800mw VTX Output with 1250m distance (DVR comparison) TrueRC antenna power канала Snow Man