If you crack open your GPS, you could extend the wire between the antenna and the internalantenna, but the loss from the extra wire would degrade the signal.
The aforementioned internalantenna and Windows Mobile 6 Professional are welcome additions, of course, but you also get double the internal ROM (about 163MB usable), an extra 0.7 megapixels worth of snappin' power, the promise of EV-DO rev.
This computer has no internal power supply, but when a specially designed reader sends out a radio signal, a tiny antenna draws power from the wave and uses it to wake the computer up.