I'm pretty sure it was for 49 MHz cordless phones. I have one and just today found it my storage to check the name and model number. I found this thread in my ensuing search.
I've found nothing else about it online today, however have a more than faint memory of knowing it was made for this when I picked up in the early 90s at a ham fest.
The general idea then was to cut it down for a 6m vertical.
I don't know what the matching circuit might be, if any. Why think there is one? Well, it's quite long. Certainly longer than a 1/4 wave, yet, from pulling out a tape measure, less than 3m in length which a half wave antenna would likely be. (the antenna and measure haven't met yet.)
I'd be interested if someone were to put an analyser on it. It teminates in an SO-239. For "hill", it isn't your classic fiberglass/GRP marine VHF antenna. It's uniform in diameter for its length, there isn't the ferrule you're likely thinking of. Looks to be mounted to the side of a mast/pole at it's end.
73, John
VA7OTC