We fly Alta X with a Futaba radio and receiver and recommend that you do, too!
You can choose to have the receiver pre-installed on your Alta X by choosing it as an option when you build your kit, or you can buy it separate.
Either way the controller and receiver will be bound and mapped the way we recommend in the Alta X Flight Manual, in mode 2.
Instructions for installing RC receivers on the Alta X can be found in the Alta X Flight Manual under Integrations.
Qty 1 - Futaba 14SGH
Qty 1 - FASSTest-2.4GHz Bidirectional R7008SB receiver