English 
Tiếng Việt With not too expensive materials and with a little perseverance. And with a little knowledge of radio waves, you can easily get an amplifier. With the transmission power of 3G Wifi Antennas, your home devices can receive signals much farther and better. Come on, let's make ithow to make a wifi antenna amplifierlet's go.
Items to prepare
Empty cylindrical plastic box
Old antenna (You can reuse from an old Wifi Router) along with a connector and use a plastic, non-conductive cylindrical cotton swab box with a round shape like this.
Hot glue gun
Adhesive
Aluminum foil for baking food
Caliper
Fabricationantennasignal diffuser
Use calipers to measure the diameter at the base of the antenna
Start by drilling a hole in the middle of the bottom of the plastic box, slightly larger than the diameter of the antenna base as measured above.
Cut the aluminum foil to fit the inside of the plastic box. You can use a utility knife for easier cutting. If you use a ruler to measure. Then line the aluminum foil inside the plastic box and use glue to fix the foil.
Result when completed
Insert the receiving antenna into the cylindrical box as shown in the image below and then use the hot glue gun to firmly attach it inside the box.
You need to ensure the antenna base protrudes about 6 to 8cm outwards to allow for flexible rotation at the joints.
Connect the extension cord to the bottom of the Antenna and the other end to the Module to process and amplify the wifi/3G/FM signal.
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Check if the speed has improved
Thus, the antenna amplifier is quite simple and you can see a very significant improvement in the received signal thanks to this very simple signal amplifier. Wish you success.
