Utilize a powerful antenna such as the Cellphone-Mate Outdoor Yagi Antenna, CM230-1900 for high performance signal gains. The Yagi 1900 MHz Antenna is a Directional antenna that collects cell tower signals and sends them through a cable to an amplifier or directly to a cell phone or cellular device card. In laymen terms, it will effectively provide your phone / data cards with signals versus situations where you don't have an antenna at all. Most amplifiers do recommend that you have an antenna fixated outside so you receive the most optimal performance during your conversations. The CM230-1900 is of course for the 1900 MHz band range (1850-1990 MHz) and is designed for fixed installations. Usage: CM230-1900 focuses signals in one direction so be sure this is used only in buildings or other stationary structures. Find the area outside the building whether it's a window the rooftop, or somewhere where this antenna can pick-up the strongest signal strength from your service provider- then mount it using the provided tools in this package. Check this out: [ VERY USEFUL SIGNAL CALCULATOR ] & [ FAQ A.G. AMPLIFIER'S GUIDE FOR NEWBIES ] Cellphone-Mate Outdoor Yagi Antenna, CM230-1900 features Unique broadband, low VSWR (microwave) Wall mount, outdoor use Compact Size, Low Profile Lightweight ABS Radome N-Female Connector with Pigtail Yagi Cm230-1900 Applications Outdoor systems GSM/CDMA/GPRS/TDMA systems 1850 ~ 1990 MHz Broadband working *Life Time Warranty available with Cellphone-Mate Yagi CM230-1900 Specifications Electrical Parameters CM230-1900 Frequency 1850-1990 MHz VSWR <1.5 Input Impedance 50 Gain 14dBi Front to Back Ratio >15dB Vertical Plane 72°F±5°F Horizontal Plane 76°F±5°F Polarization Type Vertical or Horizontal Maximum Input Power 100W Lightning Protection DC ground Connector Type N Female Cable Loss 0.078dB Number of Element 14 Cable 10.24 Inch Weight 0.62LB Length-Without Input Cable 27.72 Inch Rated Wind Velocity 133mile/h Working Temperature -40°F~+140°F Yagi 230-1900 Package includes U Bolt (M6 x 60 x 73) Flat Washer 6pcs Split spring washer 6pcs Hex nut 6pcs Notes: (Any obstruction can't be in the way of the telecommunication direction. Any metallic rod must be away from antenna more than three feet) Yagi 230-1900 MHz Installation Diagram Cellphone-Mate Outdoor Yagi Antenna, CM230-1900