I would suggest using duct tape, but I didn't have any around. So, here we go.
2 soda cans
packing tape/duct tape
felt tip pen
Step 1: Step one
Step 2: Step Two
Cut those two pieces of aluminum in half.
Remember to recycle!
Step 3: Step Three
Step 4: Step Four
I would appreciate it if someone who has an RFID card an scanner tries this.
Again, sorry about how sloppy this is. I hope it gave everyone a good idea of what I'm thinking.