Motorola Droid 2

anon99 said:

As to the utility of an antenna jack, this is simply about the physics. The frequencies over which current 3g phone services run are short wavelength and aren't enhanced with external whip antennas. If they were, manufacturers would provide them.

Clearly, you don't understand the physics, then.

If you get an antenna designed to work at the frequencies involved, getting the antenna away further away from physical objects (like the human body) that can block those high frequencies is always beneficial.

Also, if you are using it inside your car, truck, rv, etc, you are inside a giant metal box with a few holes in it. The metal parts will keep the signal from efficiently getting out. If you can get the antenna outside the metal box, even if the antenna is no more efficient than the one inside the phone, it will give you better results.

I have found, though I have not purchased, both antennas and adapters that will fit the jack on the droid at truck stops. I have been tempted.