said by ke4pym:
Perhaps if you live next to a TV transmitter or if there is a $3 difference between DS and QS cable or you're buying less-than-high-quality-cable-from-China (read: copper-claded center core).
For what it is worth the majority of RG-6 utilizes BCCS Bare Copper Covered Steel which is required to provide the strength needed for the center conductor to be used as a plug when terminated with an F connector?
The reason the BSSC works is RF does not flow through the center conductor but actually travels down the copper plating by what is known as the skin effect.
This is an example of what I am referring to, its a name brand coax (branded Honeywell) and note the rare earth magnet stuck to the center conductor.
Another example is attached.
To be quite frank, about the only time a solid copper conductor is required is with CCTV cabling where it is needed handle the baseband frequencies of a video signal.