The Bird AT-Series Antenna Testers provide a cost-effective, fast, graphical way of determining the quality of mobile and base station antennas. Rugged, easy-to-use, hand-held design with extended battery life makes it ideal for use in the field. Tests the system in VSWR, Return Loss, Match Efficiency, or Reflection Coefficient (Rho) Single frequency readings and frequency sweeps allow for everything from pinpointests to system optimization and tuning. Can save up to 12 traces for comparison and tracking over time RS232 Interface allows communication with a PC for saving traces using the optional software.