ME AND MY GIRLFRIEND WERE TRAVLING SOUTH ON ROUTE ONE TOWARD MOMENCE FROM GRANT PARK IL MY GIRLFRIEND NOTICED SOMETHING IN THE SKY IT LOOKED LIKE IT WAS A STREAM LEFT FROM A JET AT FIRST GLANCE. a STREAM THAT HAD SPREAD APART AND BECAME WIDE BUT IT WAS SHORT MAYBE A 1/8 OF THE LENGTH OF A STREAM YOU WOULD SEE WHILE IT WAS COMING OUT OF A JET. tHATS WHAT I SAID IT WAS BUT SHE SAID NO AND SHE WAS RIGHT. IT NEVER WENT AWAY. IT JUST STAYED THERE IN THE SKY IT LOOKED SLANTED LIKE IT POINTED TOWARD THE GROUND OR THE SKY AND IT DID HAVE A CERTAIN KIND OF BRIGHTNESS TO IT. AS IT SEEMED U MIGHT BE GETTING CLOSER TO IT. SUDDENLY IT WAS JUST SO FAR AWAY BUT YOU COULD STILL SEE IT. EVENTUALLY IT WAS JUST TO FAR TO PURSUE ANYMORE. THEN SUDDENLY A FLASH OF LIGHT SO BRIGHT IT LIT UP THE CLEAR AFTERNOON SKY FOR WHAT SEEMED LIKE THE WHOLE HORIZON IN THE SOUTH SOUTH EAST. IT WAS A SHORT FLASH. IMMEDIATLY AFTER THAT IT WAS GONE AND A BLACK OBJECT MOVED ACROSS THE SKY TOWARD THE EAST. I BELIEVE IT TO BE A BLACK HELECOPTER JUDGING BY ITS SIZE SPEED AND DISTANCE AT THIS TIME WE WERE HEADING EAST AFTER HEADING SOUTH THEN WEST THEN TURNING AROUND AND HEADING EAST ALL BETWEEN GRANT PARK MOMENCE AND BOURBANNAIS IL WE PURSUED IT FOR ABOUT 45 MIN AND GAVE UP AT THE SIGHT OF SUSPECTED BLACK HELECOPTER HEADING EAST. THERE WERE ALOT OF VISIBLE JETS IN THE SKY THAT DAY HEADING IN EVERY DIRECTION AND NONE OF THEM LEFT ANY JET STREAMS FOR THAT PERIOD OF TIME I SAT AND WATCHED THEM IN THE WALMART PARKING LOT FOR ABOUT 20 MIN JUST TRYING TO MAKE SOME SENSE OF IT AND SURE ENOUGH THERE WAS THAT VERY SAME THING WE FIRST WITNESSED IN THE SKY SUDDENLY APPEARING FARTHER AND FARHTER AWAY AS IF IT WERE CLOAKING ITSELF. SO UNOBVIOUS TO THE USUAL PASSER BYE JUST NOT PAYING ATTENTION. THIS IS NOT MY FIRST WITNESS TO A UFO OR PHENOMENOM BUT IT WAS BY FAR THE MOST UNUSAL.