RG8 Co-ax that can be buried?


A bit of technical help please?
Does anyone know of a quality RG8 co-ax that can be buried? I have about a 30' run that goes to my tower. It either has to be buried 4" to 6" under the lawn, or sleved in 4" pvc pipe with weather heads on each end.
The labor is a big difference for me. (And my gardener)
Looking down the road a bit, it's a huge hassle to do the pvc pipe since the addition of antenna's to my tower would require a 'fish tape' or strong cord in the tubing to pull additional co-ax runs through.
Experienced help pls?

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