If you have an open boat or center console you could rig a metal pole about 3/4" - 1" in diameter. You would have to jerry rig(adapt) a rod holder to the outside of the gunnel. Also the pole would have to be the highest point of anything else on the boat, it would be in a verticle position and it would have to extend about a foot below the water. You need to experiment because you may need two guide lines,one going to the bow and one going to the stern. The guide line should not be of conductive material.
Make it portable so that on a good day it lays along the sidewall of the boat and if caught in an electrical storm you can put it in place in minutes.
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