That would be one you could use. If your radio was DSM2 compatible Orange has 4ch rx for $10 U.S. You may want to consider a 2.4Ghz Orange Radio from HobbyKing. It is only $65 U.S. and will get you the DSM2 compatibility. You will have to buy the reciever, but it is just $10 more. The cool part is that as you add Tanks to your motor pool the receivers will be less expensive.

http://www.hobbyking.com/hobbyking/s...y_Mode_2_.html

http://www.hobbyking.com/hobbyking/s..._Receiver.html