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HAM Shortwave Radio Magnetic Balance Kits adopts large-size high-quality nickel-zinc magnetic ring, which can work in the short-wavelength range of 1-30MHz 1:1 balun is applicable to bipolar DP (inverted V antenna is V) Yagi antenna (40-100). 1:4 balun is suitable for the LOOP antenna and the Winton antenna (200-400). 1:9 balun is suitable for antenna. It can withstand 100W-200W. It can easily produce high-performance balun to ensure efficient radio transmission and reception. It allows you to fully enjoy the fun of DIY. You will receive the balun kits with the instructions.Or please contact the seller for the PDF instructions. Enjoy.Thx