I think you should use the boat salesperson solely for the sale. Get answers elsewhere, like here.
25 watt helm unit with a 3 dB antenna is a good choice for a smaller boat on Winnipesaukee. A taller, 6 dB antenna gives you more range on flat water, but if you break down and get beam-to some swells, the rolling will affect the performance of the 6 dB antenna more than the 3 dB due to the flatter lobe of the 6 dB unit.
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