While I'm at it, the TFAR implementation here at SimHQ is really lackluster and nonintuitive.
When I was in J-SERE last year that drove me up the wall to get working. What you do is take the userconfig folder and put it in the main Arma 3 directory:
C:\Program Files (x86)\Steam\Steamapps\common\Arma3 directory, it initially won't be there, just create a new folder "userconfig" and put the "task_force_radio" folder in there.
Then put the TS plugin .dlls in the TS3 plugins folder
Put the mod folder @Task Force Arrowhead Radio
Open TS3, enable the plugin, then start the game, go online on a server, equip a radio, and key it, and check 3D audio, and there you go.