不能。FCC一定不許。可以調製，不可發射。 (圖)

Well, there are lots of RF modulators, basically you put an antenna to it proceeded with a RF amp and you ends up with a small TV station. If anyone finds it out, you will be in trouble. Sure, since not many people are using analog signal, you may get away by doing analog signal. :) Seriously, another problem is the format. The over-the-air format is ATSC, which is different from cable's QAM. You may find something strange. here is one product for you, just $2,000. http://www.sencore.com/uploads/files/Sencore_HDTV_998C.pdf