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Antenna represents a transducer for receiving or transmitting electromagnetic waves. GSM antennas (GSM refers to Global System for Mobile Communication) are produced in 2 types: omnidirectional and directional ones, and are designated to be applied in the places where the connection with the mobile operator cannot be established. The usage of high gain cell antennas allows to increase the connection quality and the speed of data interchange in GPRS and EDGE modes. Apart from better efficiency and the ability to apply the mobile communication out of the covering, GSM antennas are known to decrease the radiation towards the user's head. It's very important, since the electromagnetic wave power absorption is brought down to the minimum and the efficiency of the antenna is enhanced. So, the use of GSM antennas provides excellent performance and high level of health protection. The function of cell phone antennas is to convert electrical power between a circuit and the air, this is why the performance of the gadget depends on its radiation and input characteristics. Selecting an antenna is a significant step, so we would advise to consult the professionals. Specialists in the company you are acquiring the antenna from will help you to make the right choice. But nevertheless, note some important parameters while selecting a cell phone antenna: - Electric power should be supplied to the antenna with no backward reflection to the circuit. It means that the feeding point supplies the power, but does not take it back; - The electric power transferred to the antenna is transformed into radio waves; - In case of some troubles with the impedance, power shouldn't be supplied to the antenna; - Take into consideration that in case the antenna is made of high-loss materials, such as dielectrics and conductors, the supplied electric power will be lost due to transformation into the heat. As far as you understand, high gain cell antennas represent a wonderful choice if you need a stable connection and high speed of data transmission. Furthermore, the use of GSM antennas decreased the specific absorption rates and in such a way tells favorably on your health.