A compact, portable repeater system is disclosed. In an implementation, the system includes a receiver configured to receive a first signal via an antenna during a first time interval, a transmitter configured to transmit a second signal via the antenna during a second time interval, and a communication isolator coupled to the transmitter and the receiver. The communication isolator is configured to communicatively isolate the transmitter from the receiver to allow the transmitter and the receiver to utilize the antenna. The transmitter, the receiver, and the receiver are enclosed within a vault. The communication isolator has a vertically stacked configuration for allowing the communication isolator to be enclosed within the vault. The portable repeater system is configured to be deployed at the same height as the antenna to at least substantially eliminate antenna transmission line signal losses.