Final answer:
O Nathan. The comma should be placed after the word 'pole' and before the name 'Nathan'.
Step-by-step explanation:
The correct placement of the comma in the given sentence is after the word 'pole' and before the name 'Nathan':
This fishing pole, Nathan, has seen better days.
The comma is necessary because it sets off the name 'Nathan' as an appositive, providing additional information about the subject 'fishing pole'.
Without the comma, the sentence may be confusing or misleading, as 'This fishing pole Nathan' could be interpreted as the full name of the pole.
It is important to use commas correctly to ensure clarity and to convey the intended meaning of a sentence.