For a few dollars of scrap material and some inexpensive radios, you can get up and running adding a very deadly skill to your arsenal: Radio Direction Finding, or how to pinpoint your enemies' location while they are communicating.

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Chapters:
0:00 - Introduction
0:43 - Materials and Equipment Required
2:10 - What You Can Do With It
6:59 - How a Directional Antenna Works
10:42 - The Build
11:29 - Hiding a Beacon
12:52 - Audio Amplitude (low accuracy)
13:49 - Using an SDR (higher accuracy)
15:06 - Plotting On a Map
19:07 - Countermeasures
21:27 - Final Thoughts