After completing the Boat Supplies quest, talk to Mowen and leave on the boat. Go up to the warehouse and get the rods. An easy way to clear the enemies is to climb the building and drop a Molotov or grenade. Head back to the boat with the rods, set them on the back of the boat, then talk to Jin. This will trigger a cutscene and complete the quest. The next quest, No Time to Talk, will start when the man on the radio talks to you.