AN ISLAND TOUR PA32 PLT TOOK EVASIVE ACTION TO AVOID AN ISLAND TOUR HELI DEPARTING ZZZ; UNITED STATES.

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I WAS ON CLB TO 1500 FT MSL JUST AFTER TKOF AT ZZZ FOR A 2 HR ISLAND TOUR. UNICOM INFORMED A TRANSITIONING HELI OF MY DEP; THEN INFORMED ME THAT THE HELI WAS NE OF THE FIELDS TRANSITIONING TO THE NW. THEN THE HELI RPTED 'CHIEFTAIN IN SIGHT;' AND THAT HIS INTENTIONS WERE TO 'PASS OVER THE BAY.' I SPOTTED THE HELI ABOUT 2.5 MI AWAY AND RPTED HIM IN SIGHT TO UNICOM; WHEN I WAS .5 MI FROM THE END OF THE RWY CLBING THROUGH 800 FT MSL. I HAD BROADCASTED ON UNICOM FREQ BEFORE MY TKOF ROLL; THAT I WAS MAKING A L DOWNWIND DEP. I COULD SEE THAT THE HELI AND MY ACFT WERE CONVERGING AND HEADED FOR THE BAY. I STARTED MY UPWIND TURN APPROX .5 MI EARLY (IE; BEFORE THE BAY) TO AVOID THE HELI. WHEN I LEVELED THE 30 DEG BANK TURN-OUT AND I WAS 90 DEGS OF ORIGINAL HEADING ON MY UPWIND LEG; THERE I SAW THE HELI ABOUT 100 FT DIRECTLY ABOVE ME. I COULDN'T BELIEVE THIS GUY; I'M TAKING EVASIVE ACTION TO MISS HIM AND HE JUST KEEPS COMING AT ME ALL THE TIME HE'S SAYING ON FREQ; 'DO YOU HAVE ME IN SIGHT;' WHILE HE IS COMING AT ME. THE HELI COMPANY AGREED WITH ME THAT THE HELI PLT WAS NOT ON HIS SUBSCRIBED RTE.