Input from the Jet-Pilots:
Please offer REX6 Assist with long antennas like REX3 A20/A40.
Typical setup in a jet is in combination with a CB2xx where the small 'cat whispers' of a standard REX6 Assist are challenged to be placed properly in a full size jet.
jeti offers every receiver with long antennas as well, but not for all it's default for most it's optional.
feel free to contact jeti and ask for the desired RX with long antennas and you will be served for sure
it seems that the long antennas are not requested very much, therefor it is not produced as stock item.
I am quite confident that even hacker will change the antennas on your REX6A to long ones for a small extra fee.
I know, you know, but just from browsing the catalogue it isn't obvious.
At Hacker you can get a REX3 with 20 and 40cm antenna (both 'spertopf' version) and a REX7 with 40cm antenna (I have used both in my gliders).
For the assist version you have to buy the REX12A to get the long antennas, which makes people consider going with rSat2 and another box for stabilization (aka Demon).