The Aaronia MagnoTRACKERELF2 Active Magnetic Tracking Antenna, 1Hz - 9kHz is usable for the full frequency range of 1Hz to 9kHz without any adjustment. Simply connect it via SMA cable to the receiver, spectrum analyzer, oscilloscope, or power meter. The internal 25dB pre-amplifier boosts the sensitivity and offers a 50 Ohm impedance output.