i received my 360 box and its up and running. i didn't change the coax cable but used the existing cable that was on my previous v6 box. do i need to change the coax cable to the one provided with the 360 box?
the cable your friend is talking about is the HDMI cable, the cable you are using may already be 4K compatible. The white coax is an adaptor if you had a Tivo box your coax screwed on, the V6 and 360 boxes both push on.