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One USB connector is for power and data transfer, the other is for a boost to power. You will want to use the power and data USB connector which is the one with two cables attached to it.
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No, the Super USB WI-FI Antenna 3 comes with a 15-foot USB cable. You can either use the 15-foot USB cable that came with the antenna or you can purchase the optional 30-ft USB cable as an accessory to use instead. You cannot go over the 30-foot length without experiencing severe signal loss.
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