With a budget of 70 yuan, it's really not as good as making your own; even the starting price for V-segment on Xianyu is already over 70 yuan.
Furthermore, for simple applications, the precision requirements for the V-shaped Yagi antenna are not particularly strict.(At least, my Yagi antenna with a spacing of at least 2 cm between elements, combined with the hand-gesture distance measurement method and the use of insulating tape to fix the feed point, all work.)
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