The App is a great tool for RV travel.
Just select the app, point the phone toward the tv towers, point the antenna the same direction as the phone. Just remember to stow the antenna before you travel.
The app says it works with 5.1.1 (the last iOS for ipad1). I find that it crashes every time I try to start it on iPad 1. App works great on iOS 7.
Geojob about TV Towers USA