High-Performance Magnetic Toroid Design: Wideband Response, Low Loss, High Efficiency, Suitable for Multi-Band Operation. High Power Capacity: Meets 200W SSB Power Requirements with Stable and Reliable Operation. Fully Waterproof: The balun itself is waterproof encapsulated; only the M-mount and cable connector require additional waterproofing. Easy Installation: Includes a built-in epoxy resin base; 304 stainless steel eyebolt for easy hanging; and two copper nosepieces for convenient connection of the oscillator wire. Plug-and-Play: No additional configuration required; simply connect the antenna and radio for immediate use. Usage Precautions: The oscillator should be as close to the balun as possible and straightened to minimize losses. The oscillator length is recommended to be equal 1 wavelength, with a minimum of ½ wavelength (at which point the standing wave is approximately 1.8). Grounding is optional; select flexibly based on the actual environment. Applicable Scenarios: Short-wavelength antenna systems; amateur radio communications (HF band); field emergency communications; radio base station construction; compatible with FT8, SSB, CW, FM, and other modes. Specification: Impedance Conversion Ratio: 1:9 Input Impedance: 50 Ω (unbalanced) Output Impedance: 450 Ω (unbalanced) Frequency Range: 1-56 MHz SWR: Less than 1.5 Power Capacity: 200W (SSB), 125W (CW), 50W (FM/AM/FSK/FT8) Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color:White Material:plastic Package Contents: 1 * 1:9 Balun Antenna Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.