Yagi antenna can be used as a reinforcement signal from the modem usb / wifi.
This picture scheme yagi antenna for the modem / wifi 
Additional Power Supply For USB
Posted by doctor on 10.37
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we get the problem on a PC or laptop in reading the USB device.
problem that often arises is unable to read the usb device. This is caused by a lack of supply voltage. to solve this problem let's try to make additional power supply.
problem that often arises is unable to read the usb device. This is caused by a lack of supply voltage. to solve this problem let's try to make additional power supply.
see scheme below :
list the components needed :
Electrolit Condensator 47Uf/25V
Electrolit Condensator 47Uf/16V
IC AN 7805 with heatsink
Additional Power Supply USB can be used for extension cable USB 10 - 20m. to get a good power supply use a quality cable.