new and high quality. Suitable for HAM with certain hands-on ability. Frequency: 5-35MHZ . It only needs to be equipped with a vibrator of 20 meters in length, which can naturally resonate in the four amateur bands of 7, 14, 21, and 28, and the influence of the height-changing resonance point is very small. This is a 49:1 balun for -feeding antenna.
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