Description: 1. The P.BOX feed box needs 3.7V 18650 (battery not includes). It is the only active antenna that does not require an external power supply and integrates a charge management chip. The MICRO USB charging port is compatible with the 5V charging head of Android phones. And charging cable, very easy to use. 2. UHF low-noise preamplifier is used. The gain flatness is very good within the ultra-wide operating frequency of 0.1-180MHZ. It provides a gain of about 20DB, even when working to 450MHZ gain, there is still about 8.9DB. 3. The receiving frequency covers long wave, medium wave, short wave, FM broadcasting band and VHF aviation band. The small ring diameter 55CM is simple to set up. It can be set up outside the window, balcony, terrace and roof. Lovers erected. 4. All the screws of the antenna are made of 304 stainless steel, and the preamplifier box is fully waterproof, which can be used for long-term outdoor wind and rain. 5. Suitable models include Desheng S-2000 PL-660 PL-880 ICOM R71E YAESU FRG-8800 and all short-wave receivers, especially for SDR receivers. Note: The antenna is equipped with a dual SMA male adapter cable, an SMA to 3.5 plug adapter cable, and an S2000 BNC adapter, which means that your radio can be used with SMA female, BNC, and 3.5 jacks. Requires additional accessories. Receivers and radios with other interfaces need their own adapters. Package includes: 1 x The K-180WLA antenna includes a ring oscillator (304 stainless steel). 1 x RF.BOX preamplifier box. 1 x P.BOX feed box. 2 x  P.BOX fixing clips and screws (304 stainless steel). 1 x double SMA male adapter cable (one meter in length). 1 x SMA male to 3.5 plug adapter cable (1 meter in length). 1 x Micro USB 2A charging cable (one meter length). 1 x TNC male and SMA male 50-1.5 feeders (10 meters in length). 2 x antenna mounting and fixing hoop (304 stainless steel). 1 x 3 PVC mounting brackets, 2 butt-throughs and 1 tube cap Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store