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It is almost exactly twice the length, same thickness more or less. Also, the RP antenna will not bend. The angled one is stuck at an angle, and the straight one just goes up.
BTW, this looks, from further research, like a standard BNC connector for walkie talkies and other radio devices. Consider maybe hitting a radioshack and bringing in the WT unit. I bet you'll find all sorts of stuff for it. Fry's Electronics (if you're in the region), or MicroCenter (how I miss thee), might also have something.