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It was a box of four yagis. The top two were mounted forward by a quarter wave. The bottom two were centered. Both pairs were stacked horizontally by the critical distance for a 14 degree null. To aim them I looked at the lower pair on a TV set and nulled the interference. Next I connected the top pair using a extra quarter wavelength of RG-11 coax prior to the tee connector. The antennas were 10 element yagis made by Taco, which are still available from Wade in Canada.
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