Conversation so far:
Who said  Kenneth, what is the frequency?
William Tager.
Who is william tager?
the man who attacked Mr.
Rather.
Why did he attach Dan Rather?
Tager claimed he thought television networks were beaming signals into his brain.
Why did he say kenneth, what is the frequency?
to find out the frequency the networks were using to attack him, so that he could block it.

Question: Was Dan Rather hurt?
Self-contained rewrite: Was Dan Rather hurt by William Tager?