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That external antenna looks an AWFUL LOT like Hawk1's blowgun dart antenna mod posted on here a while back.http://forums.x10.com/index.php?topic=17920.0My guess is the antenna on the MS13E is no more than double the wire of whatever is in there now, brought outside the case and coated with plastic. Seems easy enough to emulate...
Funny you should mention the blow dart mod, I just found the rest of my darts out in the garage! Gettin ready to mod some more!