Reconfigurable radio remote unit for distributed antenna systems, comprising a single main radio frequency board provided with a plurality of integrated radio frequency boards each dedicated to a respective frequency band at least a first electro-optical converter for converting the optical signal coming from an optical fiber connected to the input of the reconfigurable remote unit itself into an electrical signal to be sent to said radio frequency boards on a RF downlink path, and configuration means (4, 5, 6, 7, 8) for remotely selecting said frequency bands and/or for setting the power level of said frequency bands, characterized in that said configuration means (4, 5, 6, 7, 8) comprise: - a control unit operatively connected with said plurality of integrated radio frequency boards, wherein said control unit comprises a memory unit for storing at least a configuration table containing a plurality of setting parameters for each available frequency band and/or for each available power level; - activation/deactivation means operatively connected to said radio frequency boards and configured for remotely activating or deactivating each of said radio frequency boards, wherein for each of said integrated radio frequency boards said activation/deactivation means comprise at least a power amplifier with an enabling/disabling port, wherein said enabling/disabling port is operatively connected with said control unit; - power setting means (6, 7) operatively connected to said radio frequency boards and configured for remotely setting the power level of each of said radio frequency boards, wherein for each of said integrated radio frequency boards said power setting means (6, 7) comprise at least an attenuation circuit (6, 7) operatively connected with said control unit; - a control data detecting unit operatively connected with said electro-optical converter, said radio frequency boards and said control unit, and configured to check and send received control data to the control unit. - a control unit operatively connected with said plurality of integrated radio frequency boards, wherein said control unit comprises a memory unit for storing at least a configuration table containing a plurality of setting parameters for each available frequency band and/or for each available power level; - activation/deactivation means operatively connected to said radio frequency boards and configured for remotely activating or deactivating each of said radio frequency boards, wherein for each of said integrated radio frequency boards said activation/deactivation means comprise at least a power amplifier with an enabling/disabling port, wherein said enabling/disabling port is operatively connected with said control unit; - power setting means (6, 7) operatively connected to said radio frequency boards and configured for remotely setting the power level of each of said radio frequency boards, wherein for each of said integrated radio frequency boards said power setting means (6, 7) comprise at least an attenuation circuit (6, 7) operatively connected with said control unit; - a control data detecting unit operatively connected with said electro-optical converter, said radio frequency boards and said control unit, and configured to check and send received control data to the control unit.