HDTV as external monitor using ethernet connection

Hello,
I want to connect my HDTV to my iMac and use it as an external monitor.
My HDTV is about 25 ft away from my iMac.
A HDMI cable of that length cost over 200 $.
So, its not an option to me.
I just bought a smart rooter but my HDTV Panasonic Viera P50GT30 is not a smart TV.
It needs a DLNA server and I can't find one.
Question : Is there a way to use my HDTV as an external monitor using the Ethernet or Wifi connection?
Thank's,
Pierre.

This look's good.
http://www.startech.com/AV/Extenders/HDMI/HDMI-over-IP-Extender-with-Audio~IPUSB 2HD2
But its not.
OS Compatibility Windows® XP(32bit)/ Vista(32/64bit)/ 7(32/64bit) Aero themes supported

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HDTV as external monitor using ethernet connection

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