How to increase range of a mini bluetooth?

Iam using a mini bluetooth device and I wanted to extend the rangeof that.I am unable to locate the antenna in my device.So,please help me to increase the range to use it around 50m range.  

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Given the frequencies BT works at, I'd be surprised if the antenna wasn't already fairly optimal, and the thing is limited by its own broadcast power.

Re-design7 years ago
That little folded up trace of copper is the antenna, I'll bet.  You can attach a wire to it and you might get a longer distance or you might only get the same distance or you might get less.  You might even detune the circuit and not get any distance.

I'm assuming that on the other side there are the 4 connectors to the usb.