[Mr. K]

the shed needs a metal floor connected to the walls and ceilings to make a good faraday cage.

The metal could be under a plywood floor, as long as all 6 sides are connected to each other

[roadcat]

the shed needs a metal floor connected to the walls and ceilings to make a good faraday cage.

Thanks for the tips. My metal shed has strips of corrugated metal with plywood on top for a floor. The walls, doors and roof are all metal, that goes to ground. I guess I could put a layer of mesh wire on the interior floor, walls and ceiling for extra cage interception (with a grounding rod in the dirt). Thanks again for the idea.