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Fishing poles function as a [d6 2h] improvised weapon which breaks on max damage; the d8 is meant to be when used as a single-shot hunting rifle - the d4 is the usage of it as a standard fishing pole for the purposes of angling. 

So the Gentleman's Rod would be as a weapon the following:

Gentleman's Rod d6 improvised (break on max damage) or d8 single shot (as Hunting rifle).
- d4 Angling.

I could've written it better; and certainly will figure out how to finagle it out should I expand upon it.

Thanks for asking! Hope that helps.