The Shure PA411 Antenna Combiner is a compact and efficient solution for combining up to four PSM (Personal Monitor System) transmitters to a single antenna, reducing stage clutter and optimizing RF performance. It operates within a frequency range of 470-865 MHz, ensuring broad compatibility with Shure wireless in-ear monitor systems. The PA411 minimizes signal interference while providing consistent, reliable RF output for improved audio clarity and performance. It also features a convenient internal power supply to power all connected transmitters, streamlining the setup process. The rugged, rack-mountable design ensures durability, making it ideal for both touring and fixed installations.