You can use metallic cans such as coffee cans to create a wifi antenna or amplify a previously existing one. It can be useful in places where you don't have access to a boosted signal, and a fun do-it--yourself idea for those so inclined.
Instructions
1. Measure the diameter of the coffee can. You'll need to drill a hole in it for the N-female connector. The placement will depend on the diameter of the can. Use the following measurements as a guideline:
* For a can with a 3-inch diameter,the hole should be 3.75 inches from the bottom.
* For a can with a 3.25-inch diameter,the hole should be 2.5 inches from the bottom.
* For a can with a 3.5-inch diameter,the hole should be 2.07 inches from the bottom.
* For a can with a 3.75-inch diameter,the hole should be 1.85 inches from the bottom.
* For a can with a 4-inch diameter,the hole should be 1.72 inches from the bottom.
Measurements should be as precise as possible.
2. Drill a hole in the side of the can at the point you have measured. The hole should be just large enough to fit your N-female connector in. Usually, either a 1/2-inch bit or a 5/8-inch drill bit should be sufficient.
3. Solder a 1.2-inch length of 12 gauge solid copper wire into the back of the N-female connector. The wire should be 1/4 guide wavelength size.
4. Insert the combined N-female connector and copper wire into the hole in the coffer can. The wire should be on the inside of the can with the N-female connector sticking out of the side. Solder the piece in place.
5. Connect the N-male end to the pigtail to the N-female connector sticking out of the can. Then connect the other end of the pigtail to your wireless network card.
6. Point your new antenna at the proper angle to achieve a signal. Generally speaking, the antenna should be pointed at the same angle as the antenna it is transferring signals to. You may need to determine this through trial and error if you do not know the exact angle of the receiving antenna.
7. Place the antenna on a tripod or similar device to hold it in place once you have determined the ideal angle. It should deliver a 10 db gain at 2.4 GHz or thereabouts.
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