WDCT is DECT and at 2.4GHz, and thats why WDCT and BT antenna had the same part number back in ~1999, now discontinued and replaced with the latest BT antenna. Check out my post on what FAKRA connectors are keyed for. You might be able to get a 5m Jack B - Jack B cable on eBay.
http://www.xoutpost.com/navigation-s...ding-list.html