Ujjdwiurgh 10KHz-180MHz Mini Active Antenna LW/MW/SW/FM Aviation Portable High Gain Loop Antenna Compatible SMA-K/SMA-J Connector

You can DIY upgrade and modify the battery size yourself. In active mode, the gain is about 20DP. The built-in 650mAh lithium battery has been used for more than 24 hours. You can turn off the power and use a small ring antenna in a passive state. (Passive active dual use) has excellent reception performance in medium and short waves. It can be hung at a high place or used in an open space. The antenna board is designed with suspension holes.