Your time is almost up for making an uninterrupted transition to the Digital Broadcast signals if you get your local signals off of some sort of antenna. I don’t want you to panic, but if you haven’t taken care of the necessary items for making the transition complete, you do need to hurry that process.
If you still have an analog TV and you’ve already hooked up your digital-to-analog converter box, you can see what your signal strength is on the little graghic meter most all of them have. The same goes for your Tv with a digital tuner. That graphic can usually be found in the setup menu or, some even make it available under the display or info button on the remote. All of them are different so you will have to find out where it is, (usually it is fairly easy to find.)
After you have found that graphic try each channel and see how it reads the signal strength. You should have a signal above 50% for mote of them to show the channels. In my opinion, a decent reception level should be around 70 % or above and the graphic should be fairly stable.
If it is fluctuating a lot up and down, you probably have, or will have, something affecting the reception on that channel and you may have a little trouble with it now and again. That problem could be noticed as either pixeling (little blocks showing up in the picture) or a thing called “freeze-framing”. Freeze framing is when the picture freezes on an image and the sound becomes intermittent or drops out.
Hopefully, you have all of you channels by now and your reception is good. If not, you may need to re-aim your antenna or have someone re-aim it for you…