The Shure PA411 Antenna Combiner is a compact and efficient solution for managing RF signals in professional audio setups. This device allows for the distribution of DC power and RF signals to up to four PSM300 transmitters, significantly reducing the number of antennas and power supplies required in multi - system configurations. With a wide frequency range of 470 to 865 MHz, the PA411 ensures optimal performance and reliability. It features RF LED indicators that display signal presence and overload status for each input, along with a front panel power switch for easy operation. The robust design includes four BNC inputs and one BNC output, making it a versatile addition to any audio setup.