Specifications include, but are not limited to: A) Weather-resistant portable radio frequency direction finder with compact antenna/modules including: a. Base unit hard-shell case b. Tripod c. Cable sets with converter d. Transport bags/cases e. Lithium-ion battery packs with charging cradles and plug-in power supply f. Antenna backpacks B) The portable direction finder (base unit) with antenna/modules must have the following: a. Frequency range in direction finding mode from 20 MHz to 6GHz b. Frequency range in receive mode from 9 kHz to 7.5 GHz c. Integrated, fast wideband receiver d. High-precision correlative interferometer DF method e. High-resolution IF spectrum f. Control and system software g. Integrated map display including triangulation for transmitter location h. External GPS receiver i. Compact DF antennas and accessories C) The base unit must have the following: a. IF spectrum (max. 10 MHz) b. Spectrogram (waterfall display) c. 6‑cell lithium-ion battery pack with charging cradle d. Plug-in power supply e. SD card for storing user settings f. Shoulder strap