We coat the antennas in order to eliminate Aluminum Oxide or Hydroxide, which is what (clear) XIM 400 does. 73, Joe wd5fhg -- 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