I'm actually more concerned about lightning strikes hitting the antenna, frying the Pi, traveling down the Ethernet cable and frying my router. I'm still a ham in training but I've been told that it's best practice to disconnect the antenna and isolate it from your setup. Some hams as far as placing their connectors in glass jars.

I don't want to use a relay on the antenna cable because 1) it'll pick up RF interference, and 2) if a direct strike hits it, there'll be enough energy to jump the gap in the relay anyways.

I might figure out a more permanent solid-state solution in the future though. Like I said, still learning :)