While the iPhone 4 looks real nice, my iPhone 3GS work A-OK. The only thing
that it lacks is a mechanism to boost antenna signals.

Googling shows i-Tenna, which is a scam, and some rather involved setups for
car use, that seem to work, but alas--they are not truly on-the-go

So, is there any antenna boosters for the iPhone that are mobile and
actually work? I figure it would be something that would have it's own
case & such...