What the heck is this thing??

Found this in my box of electronic wires...
No Idea what it is? see the pics below

wireless antennae? its got a 1/8 inch plug on one side, and something else on the other...see the pics...
also on the underside of the 'something else' is a screw that looks like it might fit a tripod...

thanks

 

It's a calibration mic for a home reciever, it's for setting up your surround sound.