Since you are looking for first hand information I can tell you that I have used the SprintPCS aircard throughout the delta (even occasionally on the Delta while boating). I had an unlimited data plan which ran $60/Month. This is a viable option for a single computer.
I have included the SprintPCS coverage map (each carrier has their own) which should help determine coverage areas as you shop for that perfect "country home".
Lewis S. Bishop
Realtor, Windermere Rowland Realty
Direct: 925-368-7738 | eMail: email@example.com | URL: http://www.LewisBishop.com