Q&A for How to Make a Wi Fi Booster Using Only a Can

It reflects a signal from the reflective side (inside of the can) to the antenna and vice versa, causing the signal from the antenna to go in one side. This almost doubles the signal going to the reflective side, while killing the signal on the other side.

The can is acting as a parabolic reflector, just like on the old multi-element television antennas.

No, as it is not made of a reflective signal material such as aluminum is.

Yes, of course. It's more about the shape and placement. So use a base (thick paper for instance) to make the appropriate shape in case of using thin foil.

You can buy WiFi boosters on Amazon, but they won't look like this one (made of a can).

Place the modem next to device you want to connect.

Your bandwidth has a ceiling based on your Internet service package. However, you can maximize that by having the strongest signal possible, keeping all devices on your network free of spyware/malware and, where possible, using an Ethernet connection rather than wireless.

You can buy outdoor WiFi antennas on Amazon.com that can pull in an open WiFi signal from up to 6 miles away. That might be a potential solution for you depending on where you'll be exactly.

You can put it on both sides. Your choice. Putting it on one is economical and boosts the one side. Putting it on both is not bad at all.

Iron sheet won't be as helpful as the aluminum foil or a can. The reflector on foils and can are more than strong enough to reflect the signal to your device.