Ok, I recently bought an HDTV, it has a built-in tuner. I also have digital cable as well, but it's not HD cable...the thing is, there are "free HD channel previews" running from like the 16th to the 24th on my digital cable service....how would I access thses channels? Would high definition digital signals be able to go through the coax cable jack on the cable box to the coax cable input on my TV? Would I be able to access these high definition preview channels through the coax jack? I would think that's how it would be, because HD antennas connect throguh the coax jack...anyways, thanks!