[Dujon]

Sorry, Jerry, I mis-read that as a three element tri-bander, not four. Are you sure that's not 7dbi? That sounds more reasonable - but I'm not familiar with the KLM (apart from the fact that they are a commercial unit of some repute) so I'll stand corrected. Incidentally, is that a trapped unit or, like a rather good and extremely well constructed Japanese unit I worked on some twenty years ago and whose manufacturer's name escapes me (TET?), all done with smoke and mirrors (capacitive and inductive coupling/matching mechanisms).

Barry, stick with what you have and see how it works, or grab Jerry's offer, is my advice. Some years ago I used an array designed for 144 MHz and consisting of two horizontally polarised 13 element Yagi type aerials vertically stacked and rotatable only in the azimuth. Even though the main lobe for reception and transmission was 'frontwards' and relatively narrow, when I swung the array towards the direction of the sun the background noise received was significantly higher.