I built a dual band VHF/UHF cheap yagi with 3 elements on VHF and 8 on UHF. I cross drilled the 3/4" PVC pipe boom and mounted the elements at 90 degrees from each other. I made the VHF elements removable so that I could easily transport the antenna in the car. I saw no interaction between the two antennas. I can definitely recommend this as a feasible project.

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