Most any new coax you buy is 3ghz. Old coax usually works just fine. I have some belden from the 80's I still use. just because it is not tested to 3ghz does not mean it can't carry it. To me a lot of the new cable "appears" to be of a lessor quality then the old.
I'm not sure if you mean a cable system for satellite TV or Cable TV.
For a satellite TV installation should I grab a roll of dual shield or quad shield?
I don't have any wire yet so I'll be buying new stuff.
Just to make sure I understand everything correctly.
Solid Copper or Copper Clad Steel:
Dual shield or Quad shield:
Any coax cable probably supports it.
It sounds like the same cheap coax the cable company uses, is that right?