The MDF 50400X from Aaronia is a Magnetic Field Tracking Antenna for signal tracking and field strength measurements. It has a high directionality making it ideal for signal direction finding. The antenna has an integrated pre-amplifier with a 40 dB gain, enabling it to measure ultra-weak signals. The preamplifier of the antenna can be operated by an internal battery (3-4 hours) or by the included USB AC adapter. The USB connection allows to read out the calibration data of the preamplifier, which are stored in the internal EEPROM and therefore can not be lost. The antenna is ideal for signal tracking and field strength measurements and is available in a waterproof case which can be placed outdoors. This field tracking antenna from Aaronia has a 10 year warranty.