The projected cost for installing antennas across the city's 135 square miles would be $10 million and another $1.5 million annually to maintain it, Neff said.
you will then know that if you double it, you will get a decent estimate of half the final cost.
Of course, this is a funny part:
Plus, the service could help make Philadelphia "hip" enough to stem the outward flow of college graduates, she [Barbara Grant, a spokeswoman for Philadelphia Mayor John F. Street] said.
First, getting widespread wireless coverage will be a temporary edge at best as other cities get networks online. Second, anyone who still uses "hip" has other problems in the cool department.