Watch the video, which includes Jonathan Mann’s “The iPhone Antenna Song” with which Apple opened their press conference (also embedded below), here.
Apple also invites website visitors to view demonstrations of smartphone antenna performance and view Apple’s testing facilities.
As Apple explains, the opposite of amplification, attenuation happens whenever a signal is obstructed. All antennas — including television, radio, GPS, and cellular antennas — can experience attenuation. And with most antennas, the density and composition of the human hand can cause attenuation to a greater degree than some other materials. On a mobile phone, signal loss typically occurs when your hand attenuates the most sensitive part of the antenna.
In photos and videos, Apple demonstrates how different grips cause attenuation on many smartphones: BlackBerry Bold 9700, HTC Droid Eris, Samsung Omnia II, iPhone 4, and iPhone 3GS.
See the photos and videos here.