A module is available to fit the JR 9X2, and the 2.4Gig version is now on sale in the UK....
I too would have said that 2.4 Ghz solved the niggling interference problems experienced with electric pattern planes,and I still believe so in relation to interference originating within the model.
However, I have had two occasions recently where the model appeared to go into failsafe:


Both times at the right hand end of the box at my field-once going vertically up (motor went to idle,model slowed then flopped,then signal returned).
And once coming vertically down at idle after 2/4 up,stall turn,-no response to 1/2 roll commandafter approx 2 secs control returned.

The only thing anyone has suggested, is that the model was fairly close, and in line with, the mobile phone transmitter booster aerial just visible near the green hangars beyond the box end-is it possible that a burst of activity from that aerial could swamp the model's signal??