wifi router of course for broadband.. you mean.. mobile broadband using usb modem with sim card in it? well the concept is the same.. you can use the 'wokfi' method or 'cantenna' method.. zzzzzzzzzzzzzz..
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I don't know about making one, but your service provider should be able to help you. With my service provider, if we have bad reception in a home/office/whatever, they send a technician out who puts a thing on your roof that leads into your house, at no cost to you. Give them a ring and see what they say.