quote from jack:

if you are wearing a jmod ez headset
and you have bob on your jmod_friends
he will see/hear your chat
and no one else will
until you take the headset off (or disable it with a command, which is in the hints for the headset)

press alt e then go to command block type jmod_friends to talk privately

has anyone tested this with the supply radio? does it let you activate the supply radio from anywhere on the map?