I don't know if this is a case of reception bars not being displayed correctly or a genuine issue with the antenna.
The following video can describe the issue better. Holding the iPhone 4 in your hands with your fingers touching the antenna seems to immediately and consistently send the bars plummeting.
http://www.youtube.com/watch?v=-ixIHyEPO5g
The following video can describe the issue better. Holding the iPhone 4 in your hands with your fingers touching the antenna seems to immediately and consistently send the bars plummeting.
http://www.youtube.com/watch?v=-ixIHyEPO5g