If you haven't been to it yet, the National Association of Tower
Erectors has a great Web page dedicated to all aspects of tower
Their monthly newsletter is there every month (as is the archives).
Lot's of good tips for anyone who has a tower.
If you have a tower, you ought to be clicking on NATE every month!!
Oh, the URL is: http://www.daknet.com/nate/
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Administrative requests: towertalk-REQUEST@contesting.com