Varying the signal strength of NFC 13.56 MHz

I would like to use NFC transmitters with about 5 meters practical working range (to a smart phone with built in NFC receiver), that's about 100 times the normal NFC range. Has anyone heard of "long range NFC"?
Is it feasible for a newbie hobbyist to build a prototype long range NFC transmitter using a standard NFC module? And what would be needed to increasing its signal strength a lot? Different antenna, more electric power, a new NFC module from scratch?
How does one achieve radio signal strength variability using a standard radio module? Maybe connecting a passive attenuator with a varistor to the antenna?
I'd be grateful for any ideas or hints to information resources about this.

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