Any Way To Improve S3 Reception?

[Rickochet]

I received a good signal in a rural location for about 18 months. For the last six months I get "no service" or dropped calls more than completed calls. I am guessing that the antenna array has been realigned and coverage is now reduced in that area. There is only one tower in that area. I can't use a femcell since I don't have internet service there and the better signal boosters are pretty expensive. Does anyone have any other way to improve reception with the Galaxy S3?