I got a good amount of experience with the switch over, as I don’t have cable in the cities, I’m using the off air HD but I have DTV in the fish house. I put an antenna in my attic and the neighbors attic and I found that the signal is very, very directional, within a couple of degrees I can get all stations, or non. Use a compass to get you close, then you the signal meter built into your new TV to dial itin. I’m able to pick up every broadcasted signal, and I’m like 35 miles from the tower in shore view (crow flys).
Use antennaweb.org, and it will tell you which antenna you need to have to get both the UHF/VHF, and the distance you are from the tower.
This winter I was going to bring up the “Square shooter” and mess with it on the lake, and see what I can pick up, using a new HDTV, so no converter boxes. I found a big loss of signal in the converter box hook ups.