1.The -30+ is a toroidal magnetic antenna. 2. The -30+ loop antenna is a popular broadband antenna. It is an effective antenna for short-wave listeners () and amateur radio enthusiasts (HAM) to receive medium-wave and short-wave in the limited living area of the city. Frequency coverage: 500kHz to 30 MHz. 5.Excellent directionality can help you reduce noise and improve signal-to-noise ratio, and can dig out weak signals that are overwhelmed by noise when conventional antennas are received. 4. The -30+ loop antenna is easy to install and can be easily installed on balconies, rooftops, and other small, compact, low-profile installations without worrying about neighbors and property opposition. 5. Another advantage of the -30+ loop antenna is that it is directional. By rotating the antenna so that the dummy point of the antenna is aligned with the interfering signal, the specific near-field interference can be minimized. Material: Plastic + Metal colour: As shown Package Contents: 1 x Antenna amplifier with 10m feeder 1 x Stainless steel vibrator 1 x Bias Power Supply 1 x USB cable 0.8m 1 x 60cm SMA Patch Cord 2 x Stainless steel fixing screw Only the above package content, other products are not included. Note: Light 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.