49:1 Balun Short Wave Balun 100W HAM HF Antenna Four Band 5-35MHz End Fed Half-Wave Antenna Ham Radio Balun for HF Short Wave. Feature: Highly Secure and Reliable, Stable Performance, Powerful Functionality for Enhanced Efficiency, User-Friendly Interface for Easy Management, Exceptional Customer Support for Peace of Mind. Specification: Certification: NONE, Origin: Mainland China, Model Number: 49:1 Balun, Package: Yes. This balun is a dedicated 49:1 balun for end fed antennas, which only needs to be equipped with a 20 meter long oscillator. It can naturally resonate in four amateur bands of 7, 14, 21, and 28, and the influence of height variation on the resonance point is minimal. Very suitable for HAM users with certain hands-on skills. The magnetic ring is a specially customized magnetic ring, and the M seat is also customized and extended. The magnetic ring is fixed with a PCB and works stably and reliably for a long time. Note: The advantage of end fed balun is that its bandwidth and gain are both good in natural resonant antennas. The disadvantage is that the loss is greater than that of conventional balun, so the end feed balun cannot be used continuously for a long time. Withstand power 100WPEP. Data communication 100W is twice the peak power. Remember to halve the power of FM and data communication modes such as FT8.