Extremely Poor Cell Service in San Clemente 92672

Hi, the cell coverage in parts of San Clemente (in and around a 1 mile radius of Avenida Ramona Street) is extremely poor. Coverage goes from 5 bars to none as soon as you get closer to Avenida Ramona. Making/receiving calls or connecting to data is completely compromised. Neighbors with ATT are also experiencing the same issue and no one knows why.

I recently moved to the neighborhood and am now considering moving to another carrier if this issue can't be resolved. 

Any idea on what could be wrong???

Thanks!