It would seem that quite a few people disagree with you. There are plenty of videos on Youtube all showing how the 4G loses signal (and drops the call) when held in a certain, not too unlikely, way.
I've seen them and I agree that the "Atomic Headslap" is due the engineers who put the things together, but the problem is very far from universal to all iP 4s, nor is any other cell phone exempt from such a problem. There are just as many people watching those vids and having trouble "repeating" what they see on screen, who are enjoying their new toy without any problems. I seriously think it has more to do with network saturation, but who knows?
If enough people pitch a proper set of fits, maybe there will be a class action lawsuit that will finally put MacApple out of business.
Obviously an antenna of any kind is subject to interference from proximity effects. The more local bandwidth that is demanded of the entire system, the more likely it becomes that any number of problems can arise.
I should not have to explain something this simple to you.
I have the perfect answer for you. Avoid, last year's technology. Buy a "N3W" cell phone system.