I think that the antenna tests on the Apple website (http://apple.com/antenna) are a little biased. I wrote a post about it here: http://allthingstarun.wordpress.com/2010/07/21/unfair/
Basically, the testers hold the phone or shfit their grip depending on where the antenna is. Ideally if a manufacturer has put the antenna on the top (HTC Droid Eris) instead of the bottom, that is because they felt that people don't hold the phone up there. And in all of the phones on the website, the tester grips the phone on the bottom. Yet with the Droid, the tester shifts his grip up to deliberately cover the antenna!
Basically, the testers hold the phone or shfit their grip depending on where the antenna is. Ideally if a manufacturer has put the antenna on the top (HTC Droid Eris) instead of the bottom, that is because they felt that people don't hold the phone up there. And in all of the phones on the website, the tester grips the phone on the bottom. Yet with the Droid, the tester shifts his grip up to deliberately cover the antenna!