faraday cages

Background: I have a virtually new 55-gallon steel drum with a steel, removable lid. It held cooking oil. The lid had a foam gasket which I removed. The lid and the drum rim have less than perfect 360 degrees of metal-to-metal contact, but close and certainly not sufficient. As is, it...

If you do how did you make yours? With the threats of emps by solar storms or other being so prominent, when do you use yours ? All day every day? Certain times a day?or only one part of the day? When would they come about? day, night? Why? And what do you feel are the important things to have...