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WiFi Cabling - dB loss per foot

The antenna on my network card needs to be sitting in my window to access a public AP. This is very inconvenient. I was thinking about getting an extending cable for my antenna, about 15 feet long, but from what I understand there is extreme signal loss per foot when dealing with WiFi cables. I forget the math but it's around 5dB of loss for 15 feet, which is pointless if your going to use a 5dB antenna.

So I'm thinking of using something like this, as it uses a USB cable to cover the distance:

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My question(s) are: Will I experience the same extreme dB loss using this on a 15 foot USB cable instead of a 15 foot WiFi cable with an antenna at the end? Is the USB signal amplified somehow? How do people who put antennas on their roof and connect them to a computer in their basement deal with signal loss on the 20-30 foot cable? etc etc

(other solutions/links are welcomed)

Thanks in Advance Guys