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I have found almost complete rolls of coax in dumpsters after satellite installers get evicted from their retail shop. Also found probably a dozen rolls of the surveillance video stuff at one of my dumpster stops. Those I keep we use those for our camera systems we sell at my office.
I stripped some smaller stuff yesterday and it seems to me to be worth stripping. Esp. if you have one of those wire stripping machines that has a wheel cutter in it. I'd first cut the wire in 10'-20' lengths and set the depth to the outer insulation. Cut it and then take the braided copper off the outside by pushing it off (sounds weird but it gets loose like a sock when you push it).
This outer weave of fine copper wire is most of the weight but there's a foil aluminum wrapping (I put foil in a compactor to make cubes, which I sell as aluminum) around a foam coated wire in the middle. The single wire inside is either solid copper or copper plated steel. Check it with a magnet.
I found it strips real fast and if you just keep it around for a "dry spell" it gives you something to do when you aren't getting much scrap.
Very easy to check, the center wire with a magnet. I found the Direct TV coax center wire is solid copper but the local cable coax is copper coated steel. I also have a lot of old coax from my ham radio antennas that I have been stripping. The ham coax is copper braid and solid copper center wire. Best to all, Mike.
I stripped alittle of the coax that I found and the center was magnetic.If the center was solid copper I still think it wouldn't be worth stripping. I would just toss it in with my insulated wire.