Using Apple's free Bumper is like applying a full-body cast where an ankle brace might do. Pick up a pack of these adorable Antenn-aids for $5 and remember, kisses help it heal faster. [etsy via iPhone Savior via technabob]
Slightly off topic, but I stopped by the SoHo store this weekend to have my 3GS looked at, and I decided to play with the iP4's they had laying about. I was able to replicate the problem with everyone phone on a single table. Of course, call quality was not tested, but it did lose half of its bars on the readout.
These look silly. Clear would've been the obvious winner.