Designed specifically for -7 and -12 multi-band portable shortwave antennas, it effectively improves antenna efficiency and enhances signal reception and transmission capabilities. Made of high-quality aluminum tubing, it's and . 32cm in length (not including screws) for easy portability and installation. Extended antenna elements can be combined flexibly. When stacking multiple antennas, it's recommended to use a drawstring to prevent shaking when raising or lowering the antenna and enhance stability. Usage Recommendations:When adding multiple antenna elements, it's recommended to connect drawstrings between them to reduce stress from sudden movements and extend service life. Suitable for amateur radio communications, field emergency communications, and other applications, it improves antenna performance while maintaining portability. Color: Blue Material: Aluminium Package Contents: 1 x Extended Vibrator 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.