As this has been a 2-year project, I really don't remember. I would certainly test different lengths. I have put one fender washer between arms at the front, offset the arm a little left, and adjusted using the 99 and 103 rather than 101 to compromise for a better signal off them. I recently ditched the Phase III mount and swapped in a Dish 1000 one, 1-5/8" mast hole, found at the curb on my walk. 99 and 103 got better. A little tedious, but playing with spacers behind the upper then lower dish mount bolts would change the angles and I imagine have an effect. Next time I'm bored, I'll try that. Every little push or pull has an effect. Your sweet-spot can only be obtained by trial and error. I am still searching for the sweetest spot but it works great already. Simply just an an academic exercise now.