[Upgrade Version] For urban , the radio reception experience is often disappointing. hardly hear any useful signals. Signals are buried in many different types of interference and buzzing. -30+ radio antenna can solve this problem. It is an effective antenna for and HAM to receive MW and SW in the environment of limited living areas in cities [Excellent Reception] frequency coverage: 500kHz to 30 MHz. The -30+ ham radio antennas is directional. By rotating the antenna so that the dummy point of the antenna is aligned with the interference signal, which can reduce the noise and improve the signal-to-noise. And the weak signal submerged by the noise can be received by the conventional antenna. Compared with the long-wire antenna, the local radiated noise suppression is up to 30 dB [Convenient Installation] The -30+ shortwave antenna is easy to set up(on the balcony, roof and other positions). It is compact and 't occupy occupy too much space. The stainless steel ring is conducive to the maintenance of the antenna. USB power supply makes charging convenient [Note] Do not connect the loop antenna to the mitter, because the preamplifier be damaged. It is necessary to prepare a PVC protective sleeve of any diameter to support the antenna. Note that the PVC protective sleeve needs to have certain strength. You can also use existing bamboo poles, wooden poles, etc. Pay attention not to use metal poles Color: As Shown Material: plastic Package contents: 1 x Antenna amplifier 1 x Stainless steel 1 x Bias power supply 1 x USB cable 0.8m(Random color, don't accept the specified color.) 1 x 60cm SMA jumper 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.