Last week, my RV.Net blog post was on TV in your RV, and upcoming changes, including digital and Satellite HD reception. A couple of things to keep in mind- the standard Winegard Sensar “Batwing” antenna will work just fine for Digital television- no need to buy a special “digital” or “HD” antenna.
There is a difference between Digital and HD. If you are going to buy a digital converter box for your RV, if you have an “HD capable” television, you will need to buy a high definition converter box. If, however, you have a standard tube type “SDTV”, one of the cheap , err…. inexpensive converter boxes will do just fine.
There is a good comparison of “Coupon Eligable converter boxes” at http://en.wikipedia.org/wiki/Comparison_of_CECB_units