My boat came with this antenna already installed on top of the mizzen mast and there is no documentation on it. It is not a GPS, radar, or vhf. At night you can see a small red light glowing on the underside of it. I suspect it may be some sort of TV antenna as there is a coaxial cable coming out of the bulkhead above a salon shelf. I can't quite make out the writing underneath. If anybody knows anything about it or how it works, your info would be greatly appreciated.