Default Any way to boost NFC signal?

I'm using an Element Recon Carbon Fiber case and while I really like it, the carbon fiber seems to weaken nfc. I had a couple tags in my car and room that I can't seem to use anymore. Do things like these external antennas (http://www.amazon.com/ipartstore-Ant.../dp/B00DE76XNY) or similar ones work at all? Its not really a dealbreaker since I still like the case, but I was just looking around if there was a cheap fix available.

Edit: Thanks for putting this in the right place mr. moderator.