Yep about the conductivity of copper clad vs copper. I wasn't even aware of the distinction until I got the EA rotor manual. The full 500' of wire I got for a ex satellite installer for free was indeed copper clad.
As for the antenna feed, it allows the easy possibility of running a mast mounted pre-amp. In my case, I will have the power injector in the attic. The injector does have to endure the high temperatures in the attic in my case.
Although, I've thought about it a little, I don;t like the idea. One could put a DC-DC converter or series regulator after the Eagle Aspen to power a preamp, but I'd rather not. Box, clamp, mounting isn't worth the issues.
I don't really think it makes sense to go any other way except dual conductors. I can't remember, if There is a small piece of siamese cable (dual RG-6) used from the attic to the mast.