Installed Morgan M-303 lightning protection to coax cables:

It is not fully weatherproof so decided to install it inside the shack:

with grounding outside the shack:

I always disconnect all cables during lightning stroms but this is just to protect against those random hits…

One important feature of this unit is that it fully blocks DC. This is important during rain/snow/sleet precipitation when static electricity can develop at the antennas and appear at the coax cable. I experienced this last winter when my K4 suddenly started flashing overload!

Note: This unit can handle full legal power on 6m band unlike most other surge protectors (e.g., polyphaser).