My longitude is 75.7. I used 72W as my true south. I had the actuator to the west by 40 counts when finding 72W. I can tune 20W to 107W. I cannot tune anything above 107W. I am concerned that trees might blocking my LOS. But, I want to make sure it is not an installation mistake. Is it possible to be on the ARC for 75%? It seems to me that it should work for the whole arc if it works for 75%....? Please help. Thanks.