If the farm is "iffy" on reception, it's surely going to be the highest area on the farm to give you best chances. Get that antenna to the top. Sometimes it will not work during times of high cell phone use or certain weather (don't ask me to explain the technical reasons why). I've had em take 2 days and all the sudden start sending pics but I know some pics are not going through. The real solution is to move em to another farm that does have solid signal or sell it & buy the Extreme 60, which is same cam without cell signal (In my opinion, the best cam made I've used and have had many going for 3 years without one being sent back - either extreme 60 or special ops, amazing quality).
Rural areas in Iowa are hit & miss with cell cams. Up by des moines and 30 miles from it, flawless. Then, it's just hit or miss on some areas. Some areas are fabulous & some, other methods need to be used.