Just test flew the P3P antenna mod on my P3S.
Test in open rural field - no or little 2.4/5.8 interference. No obstructions along flight path. Height 50 to 60 metres.
Before mod I would loose video feed around 800 to 1100 metres, control signal loss about the same, but a 1000 metre flight was quite standard.
Temperature today between 0 and +1 celsius with calm winds.
Used a 'windsurfer' for the control signal for first time.
Flew out 2000 metres with good video feed all the way, although I was getting video signal transmission weak warnings off and on from 400 metres out - which became a steady warning after 1200 metres.
Still had full control signal bars but video signal only 1 to 2 bars. Lost video feed on way back around 1400 to 1300 metres.
Could have gone further but I accomplished my 2K goal for now.
Next tests will be flights closer but with tree obstructions etc.
* note - zip tying antennas to legs over compass did not affect flight ( I did a compass calibration of course )
* mod is quite easy and thanks to OP for great instruction.