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VHF communications are line of sight. So the height of the antennas are the major factor in determining how far you will be able to receive a signal. Of course better radios will have better performance but the maximum distance is limited to the antenna height. Putting a 4 ft antenna on the deck will result if a shorter working distance than if the same 4 foot antenna were mounted on a hardtop.Be interested to hear how the 4 footer (3dB) works. I will be mounting mine in this location (a friends 205).
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All good choices.
Any reason why you are mounting the antenna on the port side? If you mount it in the starboard side the wire run is much easier. Plus, you can reach it from the helm if you need to fold it down.