PCTEL~GPS TIMING ANT 40DB High Rejection 40 dB With Enhanced Narrow Band Filtering Feature a 40 dB amplifier and narrow band high rejection filtering specifically designed to support longlasting,trouble-free deployments in congested cell-site applications with severe interference around the GPS L1 frequency. The proprietary quadrifiliar helix design, coupled with multi-stage filtering provides superior out-of-band rejection and lower elevation pattern performance than traditional patch antennas. The unique radome shape sheds water and ice, while eliminating problems associated with bird perching. The antenna may be purchased by itself or with pipe mounting hardware. Custom models or site kits options are also available. The antenna label and collar mount are color coded red for differentiation purposes. This antenna is made of materials that fully comply with provisions stipulated by EU directives RoHS 2002/95/EC.