Last week I had my first DirecTV system installed, replacing my cable service. The installation instructions emphasized that RG6 coax should be used rather than standard cable TV coax. I specifically mentioned this to the slacker installer, who of course had no intention of installing new coax. (I have been in the house 9 years, and the cable coax was here when I moved in.) The DirecTV system is working, and I seem to be getting a decent picture. But: will I get a sufficient (or any) improvement for it to be worth the effort and expense for me to replace the coax?