Very informative post. So instead of trying to improve signals in the cities where practically everbody is covered, why not start with what you so aptly called "the sticks" where I live... I know the answer, not enough people to make it worthwhile for the telecoms. Government funds that are squandered in places like Iraq and Afghanistan would be better applied to doing improvements here. BTW I should have said Taxpayers' money...
Actually the CAP and weather balloon ideas were created specifically for the sticks. Since a lot of the sticks is farming and Texas still uses a LOT of crop dusters, it was one of the factors in air safety that had to be taken into account.
Will say I am rather fortunate that I live in DFW (Dallas/Fort Worth) where this issue rarely happens. Heck almost every mall in the metroplex now has repeaters inside of them.