Dave xxxx wrote:

Can somebody help me, by giving me a link to the best quality heavy duty
coax cable that might buried in the ground.

What's it for? Audio, satellite, FM antenna?
You might be better off laying some suitable flexible pipe
and then putting whatever cable is electrically most appropriate
inside. A reel of water pipe from your nearest building site would do.

--
Eiron.

May contain traces of irony.