A method and system for reconfiguring over-indexed antenna arrays in mobile devices are provided. For example, the method includes receiving sensor input that indicates an object blocking a first subset of reconfigurable antenna elements but not blocking a second subset of reconfigurable antenna elements of an over-indexed antenna array. The method also includes configuring, based on the sensor input, a number of the antenna elements in the first subset as non-active for radiating energy and a number of the antenna elements in the second subset as active for radiating energy.