It may be a built in function but it still needs to be set up to function, the hex data has nothing to do with VHF voice, two completely separate things and why the unit has two antennas.
Yes the data back from the receiver is encrypted on its way back to the server. However you can see and use the data from the receiver if you use V6 of the Radarbox software
http://www.airnavsystems.com/download/ANRB/ANRB60002Setup.exe Connect the unit to it via your home network. You will be able to see what the unit is producing via the Mylog/reporter function and be able to prepare reports over whatever timescale you choose i.e daily, weekly, monthly etc see attached
If however you want to see the raw data packets being received from the aircraft you will not get that from any receiver as it is all decoded by the receiver and its software either at the server or locally via the V6 software.
Alan