No alvino... As I thought I said, RCA was the 3 colored plugs. Coax is the cable for cable TV, or yes, an antena should work.
A little mistake that hit me last night... You'll probably only have the yellow input(IE no audio) on that card. More than likely, you'll have to jumper it to your soundcard and simply use the line-in for coax, or perhaps some sort of converter for RCA. No biggie.