On Mar 18, 1:24 pm, Rick wrote:
Is the 2001 ARRL Extra Class License Manual still sufficient for taking
and passing the current (2007) Element 4 written, or should I spend the
money for a newer license manual?

There have been no changes in radio theory, and very minor rule
changes which affect Extra, so if you understand the material, any
study guide going back to 1990 or so should work just fine,
supplemented by a quick review of Part 97.

73, de Hans, K0HB