When used with the tape measure Yagi antenna, DF (Direction Finding) performance over line of sight ranges to 1km was quite remarkable,with a DMM (Digital Multi Meter) RSSI signal strength display allowing extremely fine bearing resolution.
Step 1: UHF tape measure Yagi
In contrast higher freq. UHF antenna approaches are more compact, and can be both readily carried thru' snagging vegetation & rapidly deployed. The receiving and transmitting electronics can also be very simple if based on the license free (but low power) 433 MHz ISM band. This perhaps suits DF (Direction Finding) for learners /scout groups working in a smaller area (such as a park), or local interference tracking.