I actually park at a spot where my bumper hangs over the ICW. The ICW, or rather a bay along on its path, is about 6’ directly below my bumper.
I’ve done this before and I’m not sure it made a difference to be honest. Just being at the water seems to make a huge difference. I can be 1/4 mile away and barely hear anything, and then everything is S9 and traffic in every freq in my radio as I pull up...straight back to nothing when I pull away.
As we sometimes post about no propagation (title of thread), it’s just not like that here. There is international propagation to some extent nearly every day here. I typically spend only a couple hours a day and have logged 140 international contacts in the past 3 weeks...all from my mobile.