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I think the wires for the stern light will interfere with the HF antenna pattern and gain. You would not get full strength in the direction of the wires. After all, one of those wires is grounded. The other wire would have some effect perhaps too.
The effect may be small, and it sometimes seems like antennas are more like magic than science, so I really have no idea what actual effect it would have. You could test it by turning the boat very slowly as you transmit to several known receiver locations - with people there who will note your broadcast heading and takes dutiful notes. You would need a bunch of receivers at different ranges to see if there is an effect.
Better yet, put the stern light somewhere else.
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