Alum or glass.... I firmly believe an aluminum boat will out fish a glass boat any day.

Polarity only effects you if you are running wires- meatlining or 'riggers. It all depends on how you fish and the boat' natural polarity. However, getting polarity below .7 means there is a ground somewhere on the boat.

Check out scottyusa.com- tons of info there.

Downriggin'
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"If you are not scratchin bottom, you ain't fishing deep enough!" -DR

Puget Sound Anglers, Gig Harbor Chapter