MFJ-270MF Lightning arrester DC-1GHz UHF-M/F 400W MFJ-270MF presents a constant 50 Ohm impedance to your transmission line SWR less than 1.1:1 Handles up to 400 Watts PEP Has one SO-239 connector and one PL-259 MFJ-270MF does not protect against a direct lightning hit