What is the best way to get OTA HD channels on my HR10-250? Can I get it if I get the correct dishsetup or does it only come through a OTA antenna? If it is only then antenna, then what is the best antenna to get and how would I know ahead of time if I even get any signals in the area worth doing this? I'm guessing I can only watch local HD channels and that no other HD channels are available to me - unless I pay a monthly high def fee to directv? Thanks!