>Can anyone tell me if an external antenna will help my reception in my car
>on my AT&T v60i GSM phone? I see that many aftermarket manufacturers market
>inexpensive antennas that stick to the roof with a magnet. Are these just
>worthless junk or do they work?
If they're properly made they work well. Try Wilson electronics for
good but not too expensive.
http://www.wpsantennas.com/ is one of their dealers.
Look at the specs of the particular antenna you're interested in. The
"db gain" number is the important one (or ones for a dual band
antenna). The higher the number the better. Of course the higher the
number the higher the price for the same type (magnet, mirror mount,
etc.) antenna.
> If it works could I also use one in my house?
Sure. You just need something about 6 inches (or larger) in diameter
that a magnet will stick to. An inverted pie tin works. (There has
to be metal under the antenna for it to work properly, unless it's
designed to mount on a fiberglass body.)

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Al - rukbat at optonline dot net