Any idea where I can go online and find this stuff. I am not having any luck locally. When I ask for HDTV coaxial cable they point me to some quad shielded RG6 coax. Is this what I would want? It is rated upto 1GHz. I need to run 50 - 75 feet in wall and overhead (attic). I also need to make a couple of runs the same length for my QS8s. Is Home Depot 12 guage acceptable for this application? Do I need to worry about attenuation or shielding issues with the speaker wire?

It's not my fault that I am ignorant...I was never taught that.