You do realize you have to first point the roof antenna to the town that is broadcasting the TV signals. Then you have to go to the TV menu and scan in available TV signals. Once the digital signals are logged into the TV set then you can watch the channels logged in...
We never used those digital converters. When it all switched over a few years we threw out our old and very heavy analog TV sets to the local dump and went to WALMART and picked up two digital LCD TV sets...
The digital to analog converter will convert those very nice digital TV signals back to the old analog mode so you will be losing out on the TV station quality big time...
Also your older setup might also need to have the BATWING Crank up antenna that looks like this photo. The add-on is dipoles that works very well with the new digital HDTV signals. Hard to beat on of these BATWING Antennas with the added dipoles.

Roy Ken