That's an old school box, one of the first designs. In order to use that box with one of today's antennas, you're going to need an adapter if I remember correctly. It steps down the two plug system on your box to mate to a single plug of today's antennas. I'm not sure if you can find it anymore.... Why did you go with this box rather than a modern solution?
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2003 GTI 1.8T
Kenwood LZ800 & Nav/Addzest DRX-9255/MB Quart QSD 3-way/Autotek 5.1 Amp/Illusion Audio ND-10
OEM HIDs/Shaved Hood & Bumper/FK Badgeless Grille/18" BBS RC/APR 91 Chip/APR Turboback/Samco DV/H&R Premium Coilovers/Carbonio CAI/Samco Hoses/PowerSlot Slotted Rotors/Goodridge Stainless Lines
http://www.cardomain.com/id/veedubb8
Talk about a rip off! i have no clue why the hell they would do that but now i'm stuck wit the module and no antenna. Worse part is the antenna is discontinued as well. 
Wondering if anyone here is looking to sell one or know where i can pick it up!! After all this work and $ i hope everything works correctly.
