The GSM-ANT108 is a passive antenna, designed specifically for GSM (Global System for Mobile Communications). It is a small and lightweight antenna, capable of supporting all frequencies in the GSM850, GSM900, DCS1800, and PCS1900 bands. The GSM-ANT108 features a low VSWR (voltage standing wave ratio) across the entire frequency band, ensuring maximum signal strength. The antenna also has excellent radiation characteristics, enabling it to transmit signals over long distances. It is an excellent choice for use in GSM communication systems, and is typically used to supplement or substitute an existing antenna.