That four hole base of the Ham M, Ham II, Ham III, and Ham IV are all identical. And I believe so is the Ham V! 73 Mike k0BUD -- 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