I did not find they interact much if you keep the ends away from the other legs. Mine is hosed up at the moment and somewhat tangled. In my case the 160, 80 and 40 meter legs are one antenna, the Alpha Delta LB. I had already removed a foot each end off the center to get all those bands into the phone portion. 160 and 80 are very close, 40 is hosed up I think because 20 meters is touching it. 20 meters low point is above 15 MHz but the icom tuner will tune it. 15 is no where in sight, uses 40 meters.... 10 and 6 have low points but need trimming. Before I start thinking about adjusting it I have to stop the ends from touching. I think the end spacing from the other legs is what is critical. My 80 and 40 meter fan works great, the legs do not really seem to interact and the swr is low in the phone sections and its quite broad banded. I love being able to jump between 80 and 40 without having to tune or adjust anything, or even switch antenna's. One time it got tangled in a storm and the swr went nuts, but I lowered it and added a spreader each side and it has not happened again. Its been stable and trouble free for a few years now.