MiFi 2200 poor signal

I'm currently running a MiFi 2200 with a Cradelpoint router and an outside antenna.  My download speeds consistently run at .14 and the upload speeds at .09.  It seems no matter what I do it won't improve.  I live in zip code 37322.  I've been told 3G is in the area but mostly it's dial up.  Verizon doesn't seem to want to help me.  They say that's the way it is and I just live in an area where the signal is poor.  Anybody have any ideas?  I also run a signal booster as well.  The nearest tower is 6 miles away.  If I can't get this resolved I won't be renewing my MiFi contract,