CARPINTERIA, Calif. (KEYT) - A plan for a new cell phone tower in downtown Carpinteria is getting a closer review. Three sites are now being studied as an alternative to the tower that was proposed on a building on Linden Ave. and Carpinteria Ave. Currently it is home to several businesses including Pacific Health Foods and Sushi Teri. Verizon and Centerline Communications believe this is the best spot to improve the signal strength they need.…