Is saw this article at MyTreo.net. The article details a new short antenna that is available for the Treo 650 and 700. This antenna is made by a person who got tired of having a large antenna and decided to make his own short one. Once he did so, he decided to sell it to other Treo users.
The author concludes:
“I think there are three groups of Treo users: those that want a shorter antenna on their Treo, those that don’t care about the antenna length, and those that actually like the longer antenna because it gives them a handle. If you fall into the first group and like the idea of a shorter antenna, then I’m pretty sure you are going to love the short antenna. It looks great, it doesn’t have a noticeable impact on reception, and it is incredibly easy to install.”
If you are longing for a Treo 680 because of its slimline, antennaless shape, this may be the solution for you.