If the signal is weak, you would have to rotate it pretty accurately so just random try's isn't going to work (quickly).
Since you know in advance where you're going to camp, use the app while you still have signal to help you determine the angle of rotation (off of true north) and then your phone compass to orient that relative to how your RV is parked.
I believe the point on the crank is off by 90 degrees. It's easiest to just to look outside until you figure it out. The antenna's extended arms should be open to embrace the source of the signal (eg, not pointed at the source).
I use the cable connection all the time for a tv out side while ushering ant. Works great and I know I am going through booster due to fact I forgot to turn it on once and no channels as soon as switched on I had signal. Now your may vary