I often use connectors from the local auto parts store for my various home antennas on towers, poles, etc. Never had one fail and the price is right. Some of the connectors similar to the one Mark suggested, especially with many pins, can be hard to connect and disconnect, especially in Alaska when it is very cold. A little trimming of some of the "rubber" with an exacto knife makes them easier to use. Probably even more selections at a good trailer supply dealer. For non critical HF probably could even run RF through a pin for a SHORT distance, especially if there were grounded pins on each side of that pin, but I have never tried that myself. I live in a dry cold climate far away from the seacoast, so no personal experience around a humid, warm, salt water areas. I have used these connectors on horse trailers for a few years in Alaska where road salt can be nasty, but never any failures, possibly it was just luck. These auto connectors also are handy in the shack. For example I use one on my 24 volt shack supply, so no danger in plugging that supply into my other 12 volt "stuff" which uses Anderson power poles. Cheers, Rick KL7CW