2007 Radio Modems

Can I use the 2007 radio modems with the previous radio modems?

No. These radios are new for 2007 and can not be used/interchanged with previous radios/modems.

Are the antennas for the RC and OI are interchangeable.

Yes, the Chrome Antennas on the 2007 RC and OI Modems are the same. This Chrome Antenna is different from the previous Chrome Antenna used on the OI Radios.