My local area regulations require meeting 80 mph winds. Is there a simple derating factor for ratings for 70mph to 80mph? k7puc -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm