RG6 and RG59 are simply form factors, RG6 is larger and has less loss at longer distances. Both varieties come as either copper clad steel or solid/stranded copper. You also have you choice as to the number and coverage of shielding. Solid copper is a better choice for lower frequencies such as baseband video or audio, copper clad is the more economical choice for higher frequencies above 5mhz. You can terminate either with BNC, RCA, or F connectors.