Hmmm. I use all KLMs here...monobanders, and KT34XAs (but not stacked KT34XAs). One quick question. Was he certain he has the antennas fed in phase? The little marking, usually a +, should be on the same side for all antennas. If not, he had a FB antenna for high angle radiation (BOP). Bill K4XS (with lots of KT34XAs for sale)