Older TV’s receive and process an analog signal to display a TV program. Newer TVs receive digital data and convert it into a TV program… much like your computer makes an image on your monitor… That’s digital TV (DTV). DTV can be either standard definition (SDTV) or high definition TV (HDTV).
Unless the government delays the transition again, in June 2009 all TV broadcasters will switch off their analog transmitters and broadcast only DTV. While a lot of programming will be HDTV, for at least the next few years most programming will be in SDTV.
You will still be able to use the old TV in your RV along with your RV’s TV antenna but you’ll need a converter box.
Many TV broadcasters are already broadcasting DTV and RVers are finding they can’t receive TV signals at their favorite campsite even though the could before DTV.
Like all things digital, DTV is all or nothing. As such, if you have a strong enough signal you will have a great picture but if the signal drops, the receiver will loose the digital information needed to make the picture so the screen will freeze or go blank. No more watching a TV program through the snow like we did with weak analog signals.
Get more information on digital TV
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Flojet Macerator Pump 
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The antenna thing we were told if we had the old antenna that came with the rig (which the old got destroyed in a windstorm before we came along) that it would have to be upgraded as well even with a converter box?? that is the commercials here locally as well. They didn’t until recently in the past couple months make that known that an upgrade in antenna was necessary as well depending on the age.
You do need an antenna but it’s my understanding that the existing crank up antenna on the roof of most RVs will receive DTV signals. It may be that newer antennas are optimized for DTV frequencies but I’d try my old one first… except that YOU need a new one anyway 😎