Manual not available, so I can't figure out why it includes 5 servos. Presumably, on the minimum 4 ch radio it calls for, you'd use a "Y" cable for the two aileron servos. One ele servo in the pics. And I assume one for rudder. Plus the channel needed for the ESC for throttle. So that leave one mystery servo, that you may not be able to control. It doesn't appear to have flaps. Maybe for nose wheel? If so, then a second Y coming off the rudder channel will work for that, also.

Other than that, your radio will work just fine for it. It's nicer to have seperate channels for individual adjusting of each servo, but without you just have to do a bit more mechanical adjustment. You may have to get an in line "servo reverser" for one of the ailerons (or rudder/nose wheel), but unlikely - Horizon usually thinks about that sort of issue in their designs, and sets them up so a standart Y works just fine.