I ordered 2 sets of these antennas:
https://www.banggood.com/2_4GHz6dBi...
to improve range and allow Me to set antennas as I want on My Flysky FSi6.
I also uploaded firmware mod to allow Me to use all 10ch via IBUS and to do that I used TTL adapter like this one:
https://www.banggood.com/FT232RLFTDI...
and uploaded firmware from this site
https://github.com/benb0jangles/FlySk...
This movie only show how I modify antennas because I already did upgrade firmware before.