It's marked Diamond RH701.
Mine arrived with a solid threaded metal plug where the SMA was supposed to be. It doesn't fit the QuanSheng TG-UV2 at all. The package was marked "SMA Connector", but it's not true for my example. I believe that this is a simple mix-up with the manufacturer. It's supposed to have an SMA. I'll contact DelExtreme and see what they can do for me. They're a very good company and this is the first minor glitch I've had with them. They have an excellent claims service.
UPDATE!! DealExtreme is sending a replacement. They are a great company to deal with.
UPDATE 2 - The replacement antenna, same stock number, arrived today (7 Dec 2010). The connector is correct this time. It screws into the TG-UV2 just fine. but the outer shell doesn't fit quite as perfect as the original antenna included with the TG-UV2. But it does fit.