No. .320 is actually solid sheathed or hardline. RG-11 is the usual braid over foil. .320 has a bit less attenuation than RG-11 with better shielding due to it's solid sheath. The application is a CATV drop cable though I could see it used for long DBS runs. No need to use it for video because baseband video only goes to 6Mhz. That's why the old mil spec RG-59 with copper braid, solid copper center conductor and solid poly dielectric is normally used.
As to RG-8, don't confuse your cables. RG-8 is similar in size to RG-11 but is a 50 ohm cable used in communications like to connect a transmitter or receiver to an antenna. It's smaller counterpart is RG-58 which you might remember from the CB radio days and the old thinnet computer networks. All CATV cables are 75 ohm.
You mentioned head-end cable. If you are talking about the cable used to interconnect equipment in the racks at a cable companies head-end, that would usually be either an RG-59 or an RG-6 size cable. Head-end lashup cable is a special highly shielded cable with a silver plated center conductor.
-Hal
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