I specified my boat with a factory-fitted Fusion entertainment audio system. The sound is good, but the radio reception is lousy. Today I finally bit the bullet and traced the antenna wire from the Fusion controller. It goes through the heads compartment, through the port cockpit locker, and into the space under the back of the cockpit. In there, it disappears up behind the gas bottle locker. I can't see it or touch it, but with my phone I was able to get a photo of it. It goes into a metal thing, probably about 3cm square, which is fixed to the rear bulkhead of the cockpit locker. There's nothing on the other side of the bulkhead. What on earth is it? There are three screws, I guess one holds it to the surface, what are the other two? They look loose - do you think something should be connected to them, to form a dipole antenna?
Any thoughts would be very welcome! Alternatively, if I were just to connect another antenna to the Fusion unit, what would you suggest?