R9
"I'm not using it on a wing but has great range and I haven't had the failsafe go on yet."

Supports ACCESS from the factory, but can be flashed to ACCST compatible firmware.
The 915MHz R9 Slim+ OTA receiver implements the ACCESS protocol and supports wireless firmware updates over the air making binding to receivers even easier. As well as the convenience of checking the current receiver firmware version.
The R9 Slim+ OTA is designed with dual antennas to improve signal strength. With a compact form factor design, it also features 6 PWM outputs, and this long range receiver with the flexibility to work with more external devices by incorporating the inverted SBUS and S.Port outputs.
For use with the R9M 2019 Module (or original R9M if rx is flashed with ACCST firmware)
Check out the rest of our R9 900MHz gear, and all our RC transmitters, modules, and accessories!