Tests are conducted to measure how effective metal garbage cans are at blocking high-frequency energy, such as that released by an high-altitude nuclear electromagnetic pulse (EMP). Tips are provided on how to greatly improve the shielding effectiveness.

Disaster Preparedness for EMP Attacks and Solar Storms– (book mentioned in the video).

Another EMP video by disasterprepper- EMP Introduction to EMP and Faraday Cages

Thank you, Whiskey-34 for sending this video over!