Some claim it is helpful to place metallic objects inside rooms with high radio frequencies to lessen the effects of exposure. All materials absorb radio frequencies to some extent, but all metals are conductive and reflect radio frequencies.

With a hyper-logarithmic antenna and a spectrum analyzer, you could see that metallic objects and even partially painted rooms with RF-shielding paint will usually increase the power density measurements of RF, the reflection rate, and the co-signaling interference.

Adding metal or partial RF shielding will increase high-frequency noise.

A standing wave is created when an incident wave and the reflection wave collide. A standing wave will have a higher voltage amplitude than the original incident wave producing harmonic transients.

Fractals from standing waves are created when an incident and reflection wave collide.

Truths regarding studies:

1) There are various ways to interpret physical phenomena, experimental results, and data once a test has been conducted.

2) Even the most intelligent PhDs make fundamental mistakes, primarily when operating outside their expertise.

Image: Left side: RF reflecting off of Metal, Right side: RF passing through wood, glass, and plastic.

Because RF is electromagnetism, metallic objects, iron, in particular, will fill the core of the solenoid effect of RFR and amplify the intensity. This is how and why electromagnets can be hundreds of times more powerful once an iron core is inserted inside a solenoid coil.

Please, see the diagram: Iron Core Solenoid

A Step-up core transformer can exponentially increase voltage.

Image: Transformer drawings with primary and secondary coils. More windings on secondary side yields a step up, fewer windings on secondary side yields a step down.

It's not the material.

Many materials block RFR.

However, when considering a grounding pad; the user is an electrical conductor bonded to the grounding pad and will becomes part of the current that flows through the grounding pad. The user's body voltage will read zero but can conduct several amperes of current.

Suppose that a grounding pad is plugged into the grounding pin of a wall outlet. In this instance, the pad corrupts the ground and vice versa.

If there are high-frequency transients on the ground, which there often are, and there is current on the home’s ground conductor, which there often is, then this will all back-flow onto the receiving user, termed: the victim, or you!

Partial RF clothing is another ridiculous EMF gimmick. You may block the radio frequencies with that RF fabric shawl or hat. Still, you are wearing an electrical conductor that increases your voltage and epidermal frequencies, weakening your cells’ insulators.

The bottom line is that before you go out and spend hard-earned money on the latest-greatest EMF shielding device, please be sure it is scientifically feasible.