Check the listing for details. MX-304 3X4 Antenna Switch for SDR Transceiver with Manual Control SO-239. Color: Black, Condition: New. Listed at 180.48 USD. MX-304 3x4 Antenna Switch is used to connect 3 antennas and 4 transceivers. Users can choose their own desired antenna and transceiver through the two switches on the panel. Meanwhile, the transceivers that are not selected will be automatically bypassed to a 50Ω/150W high-frequency dummy load to avoid damage to them due to operational errors. The antennas that are not selected will be automatically shorted to ground. After the whole machine is turned off, all connected transceivers will be connected to the dummy load. Specifications: Impedance: 50Ω Input voltage: (10-14V)/0.5A Withstand power: ≤ 200W Insertion loss: 0.2dB Operating frequency: DC-30Mhz Interface: SO239 SWR: ≤ 1.5 Size: 185 x 160 x 65mm (WxDxH) Weight: 1.2KG Package: 1 X MX-304 Antenna Switch1 X DC Cable