DSM is only in the DX6 radio which is for aircraft or ground. AR 6000 is the only rcvr that works with it. DSM2 is in the rest of the Spektrum radios but the AR 6000 rcvr will work with them also. I have 6 of them working with the DX7 radio. It's a good RCVR as it has 2 RCVRs built into it and it is full range. The 2 ants. are 1 for each rcvr.