2 antennas accommodated; 1 receiver accommodated; impedance data, 200 ohms input impedance, not rated for output impedance; 100 to 4000 c frequency range; operating power requirements, dc, 28 v; 2.750 in. By 3.000 in. By 3.900 in. Over-all dim.; rack mtg; jetds identification, antenna selector, c4808/arc 50