Not very well. CB radios operate around 27 MHZ and Marine VHF is around 156 MHZ. It may do something but a coat hanger would work as well. In the extreme case, it could damage your radio.
In the lakes region, you will have a problem getting stuff like this mark-up or not. If I had to buy it locally, I'd call all the marinas, and visit only the biggest stores. I'd really try to but it over the internet, there just isn't much selection of marine electronics in any retail store.
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