A novel single frequency repeater is disclosed that eliminates the problems of feedback and concurrent oscillation. The single frequency repeater of the present invention comprises a backplane, a first antenna, a filter, an amplifier, a power supply, a switch, and a second antenna. The first antenna, filter, amplifier, power supply, and switch are mounted to one side of the backplane. Preferably, the backplane is electrically grounded. The second antenna is mounted on the second side of the backplane, in an orthogonal direction to the first antenna on the first side of the backplane. By placing the first antenna in the back lobe of the second antenna, separating the first antenna and the second antenna with the grounded backplane, and mounting the second antenna in an orthogonal orientation to the first antenna, problems with feedback and concurrent oscillation have been overcome.