If your goal is simply to reduce exposure to everyday radiofrequency (RF) and magnetic fields (MF) without making major changes to your home, it's useful to separate the two because they're different problems.
1) "Grounding yourself" from RF/MF
Grounding your body is not a reliable way to protect yourself from RF (Wi-Fi, cell signals, Bluetooth). RF energy is electromagnetic waves traveling through space, and connecting yourself to electrical ground does not block them. In some situations around electrical wiring, grounding yourself could even increase your contact with certain low-frequency electric fields.
If you're trying to reduce exposure in practical ways, the biggest reductions usually come from:
- Distance: Moving even a few feet farther from a router or other transmitter can significantly reduce RF exposure because signal strength drops rapidly with distance.
- Time: Spend less time with devices pressed against your body.
- Power: If you don't need Wi-Fi overnight, turning the router off reduces RF from that source.
- Wired connections: Ethernet instead of Wi-Fi where convenient.
For magnetic fields (like from transformers, motors, or some appliances), grounding doesn't help. Magnetic fields are best reduced by:
- Increasing distance from the source.
- Spending less time near high-field devices (e.g., induction cooktops while they're on, large power supplies).
- Avoiding sleeping immediately next to devices with large transformers or motors.
2) A small Faraday cage from practical objects
A Faraday cage can block many RF signals if it's made from continuous conductive material with few gaps. It does not block static or low-frequency magnetic fields (like 50/60 Hz power-line magnetic fields).
Some practical options:
- A metal cookie tin with a tight-fitting metal lid.
- A clean metal paint can with a metal lid.
- A conductive RF shielding pouch (commercially made).
- Several layers of heavy-duty aluminum foil wrapped completely around an object (avoiding tears or gaps) if it's only for storage, not regular use.
Things that don't work well:
- Wire mesh with holes comparable to the signal's wavelength.
- Containers with large plastic windows.
- Metal containers with poor electrical contact around the lid.
If you want to test one:
- Put a portable AM/FM radio or phone inside.
- Close the lid completely.
- See whether reception drops. (Cell phones may still receive signals if the shielding isn't very good because networks use multiple frequency bands and relatively strong signals.)
If you're trying to make a "quiet box"
If your idea is a small enclosure for a phone or another device when you're not using it:
- A metal tin with a well-fitting lid is often surprisingly effective.
- Adding conductive gasket tape around the rim can improve shielding if you're experimenting.
- Remember that if a phone is sealed inside and still powered on, it may increase its transmit power while trying to reconnect to the network, which drains the battery.
One thing worth keeping in mind
The RF levels from typical consumer devices in normal use are generally well below the exposure limits established by organizations such as the International Commission on Non-Ionizing Radiation Protection and the World Health Organization. If your goal is simply to minimize exposure where it's easy and practical, increasing distance and reducing unnecessary transmit time usually has a much larger effect than trying to ground yourself.
If you're asking because you have a specific source that's bothering you (a Wi-Fi router, a nearby cell tower, smart meter, ham radio antenna, or power lines), I can suggest the most effective low-effort approach for that particular situation.
