MFJ 1702C Antenna Switches employ centre-ground protection. The unused terminal is automatically grounded for static and RF protection. They provide better than 60 dB isolation at 300 MHz and better than 50 dB at 450 MHz. They have less than 0.2 dB insertion loss and nominal SWR below 1.2:1.
These antenna switches feature cavity-type construction, 50-ohm impedance, mounting holes, SO-239 connectors, and can handle up to 2.5 KW PEP. If you are looking for a 2-position antenna switch with built-in lightning surge protection, then these MFJ 1702C Antenna Switches from DX Engineering are what you need.