KO 2.4 RECIEVERS

[GRIFF55]

Could somebody tell me the differences between the recivers apart from the price. Bit confused as to which is needed for the ko 2.4 system

[DaSloth]

only difference i could find is antenna is coax on the 409s for longer range and the 407s has a standard (copper?) antenna

EDIT: and it looks like the 407s is 3 channel and the 409s is 4 channel