Radio is different. I believe I am right in thinking that it is illegal for you to transmit on the mobile wavelengths, so you can not yourself boost any signal.
The femtocell, as suggested by ll_billym, is "run" by the service provider who has a licence, so that can be an option.
But I suspect the least hassle option is to check all 4 licence holders to see if any have better coverage in your area (there must be info on the Net) and/or write to the ones you are presently on encouraging them to consider putting a mast up somewhere nearby.
Apart from that, I guess there are pros and cons to the seclusion of village life.