Is therena wall locator like there is for finding stdds in walls for cable coax?

Yeah, but not like a stud finder. Stud finders actually measure density and can be thrown off by a few things in the wall.

What you're looking for is a tone generator.

This is an example: Amazon.com: Cable Wire Toner Tracer Tester Generator Signal Probe: Home Improvement

I've never used that particular one, so I'm not sure how well it will work.

Tone generators don't have a lot of range. They are usually used to identify a cable in a bunch. You need to have access to an end.

There are other ways to locate cables in a wall, but the technology is expensive.

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Originally Posted by KeepItSimpleStupid

Tone generators don;t have a lot of range. They are usually used to identify a cable in a bunch. You need to have access to an end.

There are other ways to locate cables in a wall, but the technology is expensive.

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I suppose another method could be a wall scope. You would need to put a small hole in the wall though. I think the ones with lights on them can get pretty expensive.

OP: Could you provide us some more details about what you are trying to do? Perhaps it might be easier to just run a new line? Some more details would help us give you a better idea of what tool might work best or if it is easier/cheaper to run a line.