RE: Floppy antenna for Futaba Fieldforce 6 (T6X)?
I can only state that there has been no detectable loss on six widely differant types of models I have flown with it todate.
The adapters are very high quality for each of the four major manufacturers and fit with no slop or looseness. I.am using it on three Hitec prism 7X and one Eclipse seven (same adapter).
The antenna does not screw into the adapter. Instead it has an RCA jack. twenty degrees of rotation and its on or off faster even than colapsing an antenna.
I can only say that I should have done this many years ago. Heck I even like the colors, I got the purdy blue one.