For your system, you'd need to run it off the optical output on the back of the tv, there is no analog output that would be compatible.
The way around this is to use the Digital Audio Out port on the back of the tv. This is a square type port with a little flap/door over it and a red light inside. You connect a fiber optical cable to it. You'll need to purchase a digital to analog converter: http://amzn.to/1VhPiQx . This will convert the optical connection to an analog stereo connection (red/white rca ports). To that, you can then connect rca cables to the base unit for your wireless headphone transmitter.
If your soundbar is also using the optical currently, then you'd also need a splitter to share that port: http://amzn.to/1OVpxzX
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