Line level / interconnect cable – maximum length and what cable?

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A family member asked me if they can play their TV audio over the hifi. Sure - that’s easy with an interconnect cable from the TV audio out headphone jack to the line-in RCA on the Marantz amp, right? Only caveat – this cable needs to be 15 meters (about 50 feet) long if routed to satisfy WAF. Is this feasible at all and what kind of cable do I use?
 
I remember seeing some time ago this kind of kits on computer stores comprising a Svideo / Yellow RCA and a standard Stereo RCA cable and indeed they were 10-15m long.
You could however try it with video senders. A video sender can transmit digital spdif signals connecting the signal to the yellow RCA. Trust me. I've tried it with a standard 2.4GHz sender.
 
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