The WS3911-HR-3M-SMA is a 1575.42MHz GPS Antenna with dual SAW high rejection filter. It features ESD circuit protection, a patented two-stage low noise amplifier and a dual SAW high rejection filter. It also features a custom designed ceramic patch element that minimizes detuning effects caused by adjacent objects. It provides the most consistent, clear GPS signal reception while minimizing loss-of-lock in high-RF fields. Housed in a weatherproof magnetic or screw mount enclosure, this GPS antenna is ideal for most demanding vehicle mounted GPS applications.