1. The two antennas receive unwanted signals, resulting in different phases. 2. The QRM eliminator is inserted from the antenna feeder without any additional modifications to the radio. 3. It is based on a completely innovative concept that cannot be compared to normal " performance. 4. The QRM eliminator now allows adjustment of phase Angle and amplification to unwanted signals before they reach the receiver front end. 5. has a built-in PTT control that keeps the eliminator connected during transmission. However, additional auxiliary receiving antennas are required, such as a 2-meter antenna or a few meters of wire inside the shed. Power supply: 13.8V/150mA jack for PTT Frequency range: 1.8 MHz-30 MHz Colour:green Material:PC+metal Package Contents: 1X Eliminator finished (welded) 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.