I get too short distance , please help..

[Devilion]

I live in CE area , i use MP to change to FCC 27dbm + windsurfer
Latest firmware 1.9.20+ and latest app DJI GO
i got 250m and RTH kicks in...

did i already make it right ???
is it now in FCC ??? please double check for me,
what should i do to make it long distance ?

 

[kevinp3s]

MP only works with the 2.4G (video)...not 5.8G (control)...so the video link is FCC and control CE..but the windsurfer sometimes helps with the control signal...the P3S activates the RTH on loss of 5.8G (control) signal after 3 seconds