The MFJ 259C SWR RF Analyzer works for frequencies between 530 kHz and 230 MHz. With this device, you can read complex impedance values as reactance and series resistance or phase and magnitude. It can be used to read return loss or reflection coefficient at all frequencies. The device has a built-in battery-saving function, and it has a low-battery warning indicator. It will allow you to tune your antenna to the ideal value in seconds. It can also analyze coaxial information, inductance, and capacitance.