I believe that K3NA did some nice work on this subject that was published a
few years back in NCJ. I don't remember the details, but I remember
concluding that you don't want your 40M beam and your 15 M beams on the same
tower if you can help it (mine are separated by 140 ft). Also, that there
are lots of pattern distorting interactions on multiple yagis stacked on a
tower. I have 4/4 on 20M with a 3 el in between facing south. I am sure
that is not what I want to be doing and have though about removing it and
doing something else for 20M south.
Ed N1UR
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