Mount this MFJ-1704 four position SO-239 switch and youll have more than convenience of instantly selecting any of 4 antennas or center ground position --- you get a replaceable lightning surge protection that helps protect against distant lightning induced surges and static. Handles 2.5 kW PEP. Extremely low SWR. Isolation is rated better than 60 dB at 30 MHz to better than 50 dB isolation at 500MHz. Negligible insertion loss. 50 Ohm.