LJ55 CREW BECAME DISORIENTED ON THE APCH TO ILS RWY 18 AT LEB; AFTER THE ZBW CTLR TERMINATED RADAR CONTACT. THE CREW DID NOT FOLLOW THE PUBLISHED MISSED APCH PROCS.

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CLRED FOR FULL PROC AT LEB; ILS RWY 18 WITH PROC TURN. WE WERE EXPECTING TO BE VECTORED FOR THE ILS OM FROM THE N. INSTEAD; 3 MINS OUT; THEY CANCELED RADAR SVCS; CLRED US BELOW MSA TO 5000 FT; AND TO IGN (IAF). I HAD THE PNF READ OFF THE PROC; BECAUSE OF THE LITTLE AMOUNT OF TIME TO PREPARE. WE HAD 1700 LBS OF FUEL; BUT I WAS STILL CONCERNED ABOUT IT. 1700 LBS IS 1 HR PLUS FOR THE LR55 IN THIS SIT. WE FLEW OUTBOUND ON THE 318 DEG RADIAL OFF OF IGN TO INTERCEPT THE BACK COURSE LOC. I LOST SITUATIONAL AWARENESS AND DECIDED TO GO MISSED; CLBING ON A 360 DEG HDG TO 10000 FT. I WAS CONCERNED ABOUT CFIT. THE CTLR REPRIMANDED ME AND TOLD ME SOMEONE COULD HAVE BEEN THERE! WE THEN GOT VECTORS FROM THE N TO THE MONTPELIER IAF. I SHOULD HAVE COMPLETED THE PUBLISHED MISSED APCH; BUT BECAUSE OF THE RECENT EVENTS AT LEB AND THE TERRAIN IN THE AREA; I DECIDED TO OPT OUT THE QUICKEST WAY. BESIDES; I WANTED TO GET BACK IN RADAR AND AVOID HOLDING AT THE WHITE RIVER NDB. THIS WAS MY 6TH LEG OF THE DAY. IT SURE WOULD BE NICE IF THE AREA WOULD PAY FOR TARGET RADAR; CONSIDERING RECENT EVENTS AND THE AMOUNT OF TURBINE OPS IN THE AREA.