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HACK a Passive RFID Transponder/ tag Answered

I use an Amtech transponder to access my neighborhood.  The signal strength is poor and the association isnt cooperating with me to have the system upgraded or to offer me a new style of transponder. 

I opened one my my transponders and it appears to be a PASSIVE RFID device.  

HOW CAN I MAKE A PASSIVE RFID TAG INTO AN ACTIVE TAG?  I.e. HOW can I add a battery and/or larger antenna.  ANY other suggestions that you can offer would be appreciated.  

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Hello,

Did you ever figure out a way to copy this tag? Or us sticker?

Thanks,