A design based on my Armattan Mongoose Rx and VTx trays. Designed to hold a XM+ or similar Rx, and a VTx, or VTx antenna pigtail. Goes over the rear standoff's, and fits snuggly on the frame. Top plate clamps the whole assembly down.
Given the Bangarang actually has less space than a Mongoose, this design hangs out the back of the frame a little, but provides protection to the Rx. There are holes and slot for a single zip tie to hold the Rx down.
I recommend using zip ties on the rear arms, with shrink wrap to mount the Rx antennas.
EDIT: Added a version that tilts the VTx pigtail to 30 degrees. Only good to mount a pigtail, not a VTX directly. This version doesn't have the square cutout for the VTx SMA/RPSMA connector to index into the holder. This did require a change to the Rx tray to accommodate the taller VTx mounting. This will limit the space available to pass the battery lead through, but should still be possible.
EDIT 2: Small adjustment on the tolerances for the fit over the standoffs. Printed and installed the angled VTx mount set. Aside from minor tolerance issue on the standoff, the fit is perfect.