C172 PLT TRIED; BUT WAS UNABLE TO CONTACT TWO N90 CTLRS FOR CLRNC INTO THE NY ADIZ. PLT CONTINUED WITHOUT CLRNC.

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ON 04/SUN/03; I FILED A VFR FLT PLAN WITH FSS AND TOOK OFF FROM CDW. ATC WAS OVERWHELMINGLY BUSY; BUT I CONNECTED; WAS GIVEN A SQUAWK CODE AND TRAVELED AS PLANNING TO 44N. AFTER LNDG I CALLED FSS; CANCELLED MY FLT PLAN AND FILED A PLAN FOR RETURN TO CDW. I WAS TOLD THAT ATC WAS VERY BUSY AND THAT I WOULD BE FILED FROM HUGENOT VOR AND TO CALL ATC ON 126.70 WHEN I WAS AIR BOUND. I REPEATEDLY CALLED AND COULD NOT GET THROUGH DUE TO EXTREMELY BUSY RADIOS. I FLEW SQUAWKING 1200 AND DIVERTING AROUND TO THE WEST BEFORE HEADING S. AS I WAS NEARING THE CALDWELL AREA; I SWITCHED TO ANOTHER FREQUENCY I HEARD WAS IN USE AND WAS ABLE TO RPT MY POSITION. I WAS TOLD TO CONTINUE VFR. AS I NEARED BOONTON RESERVOIR; I CONTACTED CDW TWR AND WAS GIVEN INSTRUCTIONS FOR APCH AND CLRNC TO LAND. I WAS AWARE OF ALL THE SPECIAL NOTAMS REQUIRED BECAUSE OF THE EXTENDED SPECIAL ADIZ IN A 30 MILE RADIUS OF NYC; YET I PENETRATED THE ADIZ WITHOUT SPECIFIC CLRNC. I AM NOW EXTREMELY AWARE OF THE IMPORTANCE OF CAREFULLY KNOWING THE BOUNDARIES AND REMAINING OUTSIDE UNTIL CLRNC IS GIVEN; EVEN IF THIS MEANS LNDG AT AN ARPT OUTSIDE THE ADIZ.