I have to agree with QQQ. There are many different types of RG6 and you actually have to READ the label. Cable companies such as Belden and Genesis make RG6 coax with copper coated steel cores as well as solid copper cores.
Belden also makes a RG59 (#1505) that is sweep tested from 5Mhz to 3Ghz that is suitable for digital applications.
Logic is a systematic method of coming to the wrong conclusion with confidence.
