Quad band GSM 9 dBi rubber duck antenna with SMA male movable: A high-performance GSM antenna supporting quad band frequencies for broad compatibility across global GSM networks. It offers a substantial 9 dBi gain to greatly enhance wireless signal reception and range. Featuring a movable SMA male connector, it allows flexible positioning to achieve optimal signal strength in different installation scenarios. Built with a durable rubberized housing, it is ideal for GSM modules, routers, and other communication equipment, ensuring stable and reliable performance in both indoor and outdoor environments.