DIY Yagi, listen to everyone gathering

There have long been home in QinXian aircraft antennas and everyone at home when QSO lively, originally used in the unit do not know U V segment segment line does not? Spring Festival holiday a little time at home, coupled with the twelfth lunar month to see New Year Celebration postings, is hands-on time.
        First, prepare two φ4 copper rod, 80CM long 2CM × 4CM long stainless steel tube, five gates beans (old bicycle brake parts),50-5 cable a few meters. Commenced. . . .
        1, with the antenna BG9ABT formula, calculate the transducer, the director, the length of the reflector, the length of copper rod machining.
        2, calculated oscillator pitch, stainless steel square tube on top hit five φ8MM holes in the sides of the five pairs of corresponding holes to play φ4
        3, buy a little gate bean hole, drill bit sets, then assembly, welding debugging, do not say on the map

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