MFJ Enterprises Original MFJ-916B 1.8-225, 350-540 MHz Duplexer - SO-239 Frequency range: 1.3-225, 350-540 MHz. Output: 2 x SO-239 Power (Watts): 200 Insert Loss (dB): .20, VSWR: &lt;1.2 Isolation (dB): &gt; 55, Impedance (Ohms): 50