secondary tv

No, you need a coax cable connected to a box.

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A Wireless HDMI kit would solve your problem, but you have to choose the best technology.  Wireless Home Digital Interface (WHDI) uses the 5GHz frequency as opposed to the 60GHz frequency of Oats' recommendation.  5GHz doesn't need a line-of-sight to your second TV, meaning the signal can travel through walls.  If you don't have line-of-sight with a 60GHz device, you'll need "beam formers" to bend and relay the signal around corners to your second TV.  5GHz also travels up to 100 feet to your second TV.

A kit contains a transmitter and a receiver.  The transmitter connects to your cable box via HDMI cable.  The receiver connects to your TV via HDMI cable.  The receiver also needs power.  With some kits, such as IOGear, you can power the receiver with a USB cable connected to your TV set, if your set has a USB port.

What I like about the IOGear is you can use your Cox remote with your 2nd TV to control the set-top box in your living room.  The IOGear receiver, connected to your 2nd TV, will relay the signal from the Cox remote back to the transmitter, connected to your cable box.

Bruce said:
5GHz doesn't need a line-of-sight to your second TV, meaning the signal can travel through walls.  If you don't have line-of-sight with a 60GHz device, you'll need "beam formers" to bend and relay the signal around corners to your second TV.  5GHz also travels up to 100 feet to your second TV.

Can I ask where you are getting this data? How do you know what OP's 5Ghz range would be without knowing what router they have. Is it ad-hoc? I think considering the lack of understanding by OP, the scope of the question should just be answered with "No". 

I'm not talking about WLAN (802.11).  A Wireless HDMI transmitter has its own antenna and uses either 5GHz or 60GHz to transmit the signal from a cable box.

The OP knows what he or she wants (transmitter) but Cox doesn't offer it.  Therefore, a third-party device is required.  A third-party device operating on the 5GHz frequency.  So..."YES."

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I'm not promoting IOGear, but my point was to look for a device that operates at 5GHz...not 60GHz.

There is so much going on within the user's review that I wouldn't give it credit.  For example, how would the transmitter reformat the video from 4:3 to 16:9...or from interlaced to progressive scan...while still transmitting?  That some box!  These wireless boxes are just a radio antenna.

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I think he's totally confused.  Besides, my IOGear GWHDMS52 works fine.

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As the The Great Gazoo would say, "Oh, so you're the dum-dum."