Handheld Shortwave Radio
With a working Transmitter in range, home in on distant objects by navigating in the direction of the highest signal strength. The Shortwave's default tracking mode will detect signals of unknown origin, while its secondary setting is useful for locating hidden supply caches or downed aircraft. ; Useless indoors or underground.
Tools
The Handheld Shortwave Radio is a radio used in conjunction with a Transmitter to locate items in the Tales Signal Void, Buried Echoes, and Last Horizon in the Tales from the Far Territory DLC.
Handheld Shortwave Radio is a Tools item in The Long Dark. It weighs 0 kg. It can be equipped.
Within the Tools group its 0 kg is one of the heavier of the 67 entries here (#59).
Verdict: Overall Handheld Shortwave Radio is a Tools item.