The telecommunications firm first attached its name to the downtown baseball stadium when the facility opened in 1996, signing a 20-year deal priced at $3.5 million. Under the extension, Frontier's annual payments will increase each year by the lesser of 5 percent or the Consumer Price Index. Offsetting that expense, the county will pay Frontier $75,000 annually to provide free wi-fi at the stadium, said county spokesman Justin Feasel.