A DC Stop is used in multi-band base stations using antennas with and without Tower Mounted Amplifier (TMA). It prevents DC voltage being shorted out in the antenna(s) without TMA and isolates the BST(s) from external DC sources. SDP’s DC stop presents extremely low insertion loss to the RF signals and very high isolation to the DC signal. This unit can be used for either indoor or outdoor (IP 67) applications.