Let the hive mind of Engadget get that for you.
"What is the best wireless surround sound speaker solution? I have a home theater where running wires is just not feasible. I have my own speakers, so I don't want a system that has speakers with integrated wireless. I've done a far amount of research and have only come across a few companies that even offer a reasonable solution: KEF, Kenwood and Rocketfish. Is there anything else out there? What do you recommend? Thank you!"
1) RTM or when you do a channel scan it should scan twice (once digital / once analog) or have a choice for you to scan either one or the other....RTM
2) More or less
3) No, NTSC is a video format (much like PAL, SECAM) and is still used for SD material (I.e. DVD's).
More education: http://en.wikipedia.org/wiki/NTSC#Variants_of_NTSC