It's expensive, but probably your only choice, after reading your other post about crappy FM reception.
You are basically looking at $350-600 to start. It will require an external antenna for the best performance. Which carrier do you receiver at your rural location? That will let you know which system you need (e.g. dual band 850/1900, etc.)
I live in a very rural area and have poor cell reception or even cable tv! I can see a cell tower atop a hill above my home. It is a very steep hill.. To have reliable cell service tied to home security/health alert system. The higher I go up the hill, I get better and better cell service. as I walk up the hill. Walking up the hill is not something that is practical for my day-to-day life.
What in involved to get better cell reception?