The AB-577/GRC and extension kit was available from Ontario Surplus in Niagara Falls, N.Y. I don't know if he still has any left. Denis AA0YX -- 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