PLT OF B206 DESCRIBES COMS SITUATION WITH BOSTON SKYWAYS (LCL CTLR).

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I WAS FLYING A PHOTOGRAPHY/NEWS GATHERING FLT. THERE WAS AN OIL SPILL INTO A RIVER AT APPROX 6.5 DME SW OF BOS ARPT. WE WENT DIRECTLY TO THIS SCENE FROM A PREVIOUS STORY. WE THEN VIDEOTAPED THE OIL SPILL AND DID A LIVE RPT ON TV. I THEN TOLD THE STATION THAT WE WERE LEAVING FOR BEVERLY ARPT FOR FUEL. NEXT; I CALLED BOSTON SKYWAYS (BOS TWR FOR BOS CLASS B VFR HELI AND FIXED WING ACFT) FOR CLRNC TO GO TO BEVERLY ARPT. BOSTON SKYWAYS THEN SAID THAT IT WAS APPROVED; 'BUT I'LL NEED YOU AT 500 FT BEFORE PASSING UNDER THE RWY 33 APCH COURSE.' I ACKNOWLEDGED THE RESTR AND STARTED NE TOWARD GRAVES LIGHT AND A DSCNT OUT OF 1000 FT FOR 500 FT. AS SOON AS I ACKNOWLEDGED THE RESTR; THE TV STATION CALLED ME ON THE FM RADIO AND ASKED WHAT THE TURNAROUND TIME WOULD BE TO REFUEL AND GO BACK TO THE OIL SPILL. I SAID APPROX 45 MINS TO 1 HR. AS I CONTINUED TO DSND AND FLY NE; THE CTLR ASKED ME IF I HAD A B737 AT MY 2 O'CLOCK POS IN SIGHT. I SAID NO. I LEVELED THE HELI AT 500 FT APPROX 1 1/2 MI PRIOR TO XING THE RWY 33 APCH COURSE AND CONTINUED TOWARD GRAVES. JUST E OF THE RWY 33 COURSE; THE CTLR ASKED AGAIN IF I SAW THE B737 TO THE NE AT 1600 FT. I SAID YES; AND WOULD MAINTAIN VISUAL SEPARATION. WHEN WELL E OF THE RWY 33 APCH COURSE; THE CTLR SAID I COULD CLB TO 1000 FT ENRTE TO BEVERLY ARPT. HERE IS MY DILEMMA: AFTER LNDG AT BEVERLY ARPT; I BEGAN TO THINK ABOUT THE VERBIAGE THE CTLR USED. I AM 90% CERTAIN THAT HE SAID HE NEEDED ME AT 500 FT PRIOR OR BEFORE XING THE RWY 33 APCH COURSE. HOWEVER; AFTER THINKING ABOUT IT; I HAVE SOME QUESTION THAT HE MAY HAVE SAID HE NEEDED ME AT 500 FT WHILE 'ENRTE' FOR PASSING UNDER THE RWY 33 APCH COURSE -- WHICH; IF THAT WERE TRUE; I SHOULD HAVE DSNDED OVER MY LOCATION TO 500 FT AND THEN PROCEEDED ON COURSE. THE BOTTOM LINE IS; ALTHOUGH THE CTLR NEVER SAID ANYTHING THAT INDICATED THERE WAS CONCERN OR A PROB AND THE FLT WAS FINE; I SHOULD HAVE BEEN ABLE TO RECALL EXACTLY WHAT HE WANTED AND AFTER LNDG; I COULD NOT. I BELIEVE I MADE THE MISTAKE IN NOT GIVING 100% ATTN TO ATC INSTRUCTIONS. WHEN FLYING A MULTI-TASK JOB; IE; ENG; EMS; PWR LINES; LIFT WORK; ETC; THERE CAN BE MANY DISTRS FROM THE CUSTOMER WHILE YOU ARE FLYING THAT HAVE LITTLE OR NOTHING TO DO WITH THE IMMEDIATE JOB OF FLYING THE ACFT. IN THE FUTURE; I WILL LOCK OUT THE FM RADIOS TO THE TV STATION WHILE RECEIVING A CLRNC OR ATC INSTRUCTIONS. IT IS IMPERATIVE THAT ATC TAKE PRIORITY. I AM GOING BACK TO THE BASICS -- FIRST THE ACFT AND ATC; AFTER ALL IS SET; THEN I'LL ANSWER ANY REQUEST THE NEWS STATION HAS AFTER I TURN THEM BACK ON.