PIPELINE PATROL ACFT EXPERIENCES NMAC NEAR RDG.

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PROBLEM AROSE BY FLYING THE FIRST SEGMENT OF THIS PATROL RTE BACKWARDS FROM THE NORMAL PATROL SEQUENCE. (DUE TO ADDITION OF ANOTHER PATROL S TO A POINT 5 1/2 MI SW OF RDG). NORMAL SEQUENCE STARTS 12 SW OF ALLENTOWN TO 5 1/2 SW OF RDG; BACK TO ARPT THEN SW OUT OF THE ATA. ALSO ACFT USED WAS UNFAMILIAR TO ATC PERSONNEL HAVING BEEN PICKED UP THE DAY BEFORE IN NJ. INITIAL CONTACT WITH ATC WAS PRIOR TO ATA ENTRY SBOUND AND 3 1/2 MI W OF RDG. (ENRTE TO STORAGE TANKS 5 1/2 SW RDG). ACFT PROCEEDED ON PATROL BACKWARDS TOWARD NORMAL START POINT NE TOWARD RDG ALONG PIPELINE RIGHT-OF-WAY. NOTE: ACFT NUMBER AND PATROL RTE WERE UNFAMILIAR TO TWR PERSONNEL. ACFT AT RDG WERE USING RWY 36. TWR CTLR'S BACK WAS TO ME WHEN OBSERVING APCH END OF 36. I WAS PROCEEDING NE ALONG W SIDE OF ARPT WITHIN ARPT BOUNDARY. TWR STATED THAT THEY THOUGHT I WAS FURTHER W AS I WAS UPON INITIAL ENTRY INTO ATA. WHILE OBSERVING CONSTRUCTION EQUIP ALONG PIPELINE RIGHT-OF-WAY; I HEARD TWR ISSUE TKOF CLRNC TO AN ACFT. BEING WITHIN ARPT BOUNDARY; ANY TKOF WAS NOTEWORTHY. SINCE I WAS ORBITING L; AS I HAD ADVISED TWR AND RECEIVED PERMISSION TO DO SO; SMA X WAS SPOTTED NEAR COMPLETION OF L TURN AND EVASIVE ACTION TAKEN. CORRECTIVE ACTION: TELEPHONE CONVERSATION WITH CTLR INVOLVED THE WAY PATROL RTE WAS DIFFERENT THIS DAY WAS DISCUSSED. I SENT BY MAIL TO HIM THE NEXT DAY; COPIES OF RDG AREA ON A SECTIONAL CHART AND PIPELINE COMPANY MAP OF ARPT AREA WITH PIPELINE LOCATION HIGHLIGHTED. ALSO; MY INTENTIONS IN THE FUTURE WHEN THESE DIFFERENT PATROLS COINCIDE TO DEADHEAD BACK TO NORMAL START POINT AND TO ALWAYS FLY THE RIGHT-OF-WAY AS EVERYONE INVOLVED IS USED TO. CTLR WAS VERY PROFESSIONAL AND COURTEOUS; ATC AT RDG IS EXCELLENT AND EASY TO WORK WITH. HIS REQUEST FOR THESE MAPS SHOWING PIPELINE NEAR ARPT WAS REFRESHING AND SHOWED A SINCERE INTEREST ON HIS PART TO ACCOMMODATE ALL USERS OF RDG AIRSPACE.