Richard Gere has backed the building of a new cell tower in the tony town of Bedford, riling wealthy residents — including Jerry Seinfeld’s sister and the parents of actresses Rooney and Kate Mara, The Post has learned.

Gere, who co-owns the Bedford Post Inn in Westchester County with real estate developer Russell Hernandez, is offering up land on their 14-acre estate for a 130-foot cellphone tower to fill service gaps and communications for emergency responders in one of America’s richest enclaves.