Reply #1: Regarding the analysis of the tilt of the antenna and a purported tilt of the upper block.

[eomer]

Movement of the antenna cannot necessarily imply a corresponding movement of the entire upper block. Look at the first two frames of this video:
http://thomas.loc.gov/cgi-bin/query/F?c111:35:./temp/~c111PlzmYh:e131553:

You can see that the antenna drops in the time between frames 00:00:00 and 01:00:15 but that the top of the tower doesn't move at all during that same time. So the antenna is already disconnected somehow from the rest of the upper block. A tilt of the antenna cannot therefore be used to demonstrate a tilt of the entire upper block as Mackey attempted to do in his slide #7.

Watching this same video frame by frame I have to agree with you, Tony, that the upper block does not appear to tilt during the early part of the collapse.