MOONEY M20 PLT HAS NMAC WHILE IN CRUISE.

Narrative

I WAS FLYING SBOUND; NEW JERSEY SIDE OF HUDSON RIVER ON SIGHT-SEEING FLT TO STATUE OF LIBERTY WITH 2 PAX. MY SPD WAS APPROX 130 KTS AND MY ALT WAS 800 FT. I HAD ON MY STROBES; POS LIGHTS; ROTATING BEACON AND LNDG LIGHT. I SELF-ANNOUNCED BEFORE THE GEORGE WASHINGTON BRIDGE; AFTER THE GWB AND AT THE 79TH STREET BOAT BASIN. THERE WAS COM SELF-ANNOUNCE FROM SIGHT-SEEING HELIS TAKING OFF FROM THE HELIPORT S OF THE INTREPID. THE HELI PLTS WERE ALSO TALKING ABOUT SOMEONE WHO HAD NOT YET ARRIVED. JUST S OF THE INTREPID I PASSED A HELI AT MY ALT WHICH WAS POINTED W BUT TRAVELING S SLOWLY SIDEWAYS. SOMEONE IN A HELI WAS TALKING ON THE COM ABOUT A DOOR PROB AND I ASSUMED IT WAS THAT HELI. LESS THAN A MIN LATER; AFTER THE OPERATOR WITH THE DOOR PROB STOPPED TALKING I SELF ANNOUNCED AS 'HUDSON TFC; MOONEY; LAST BUILDING; NEW JERSEY SIDE 800 FT HEADED FOR THE STATUE CIRCLING CLOCKWISE.' A HELI PLT IMMEDIATELY CAME ON THE AIR AND SAID I HAD PASSED LESS THAN 50 FT OVERHEAD. MY PAX NOR I SAW THIS OTHER HELI THAT I PASSED OVER. AS I CIRCLED THE STATUE I ONLY SAW 1 HELI COME TO THE STATUE AND BEGIN CIRCLING. I NEVER SAW ANOTHER HELI AND NEITHER DID MY PAX. SO; I DON'T REALLY KNOW. I DID WATCH CAREFULLY THE HELI I PASSED AND IT IN NO WAY CONFLICTED WITH MY FLT NOR I WITH IT.