I used a KLM 4 el 40 at 80 stacked with a KT34 at 90. I experienced no noticeable degradation in performance. I expect it will work with my M2 4 el 40 at 80 and a KT36XA at 90 feet when I put them up in a few weeks out here in KH6. Bill K4XS/KH7XS ************************************** See what's new at http://www.aol.com