A C172 IN THE TRAFFIC PATTERN AT AN UNCONTROLLED FIELD HAS A NMAC WITH A C182.

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I ENTERED DOWNWIND FOR RWY 9 AT GXY; FROM A 45 DEG ENTRY. I WAS SHOWING LNDG LIGHTS AND WINGTIP STROBES AND THE RED ANTI-COLLISION BEACON. I ANNOUNCED MY POS ON THE 45 DEG ENTRY AND IMMEDIATELY AFTER TURNING ONTO THE DOWNWIND LEG. MOMENTS LATER; AS I WAS XING RWY 34; A SKYLANE FLEW DIRECTLY IN FRONT OF ME AND ABOVE ME; APPROX 20 FT HORIZLY AND 5 FT VERTICALLY. ALTHOUGH I HAD LOOKED TOWARD THE APCH TO RWY 34; I DID NOT SEE ANY ACFT. ALTHOUGH MANY ACFT WERE IN THE PATTERN FOR RWY 9; BECAUSE THE WIND WAS FAVORING RWY 9; AND I HEARD ALL OF THEM ANNOUNCE THEIR POS AS DID I; I DID NOT HEAR HIM ON THE RADIO AT ALL UNTIL MOMENTS AFTER THE NEAR COLLISION; WHEN I HEARD 'GREELEY TFC; I AM DEPARTING THE PATTERN TO THE N.' I COULD SEE ACFT X FLYING N AT MY SAME ALT. I DO NOT KNOW WHY I DID NOT SEE HIM BEFORE THE EVENT BECAUSE I LOOKED TO THE S WHERE IT SHOULD HAVE BEEN. I DO NOT KNOW IF HE WAS SHOWING LNDG LIGHTS OR NOT. THE WX WAS CLR AND SUNNY WITH A FEW CLOUDS. I AM ASSUMING THAT HE WAS ON A PRACTICE APCH ON THE ILS TO RWY 34 AND DID HIS MISSED. HE DID NOT APPEAR TO BE CLBING WHEN I SAW HIM; HOWEVER. IN ANY EVENT; ACFT X FLEW THROUGH A VERY ACTIVE PATTERN. THERE IS SOME DISPUTE WHETHER THE TPA AT GXY IS 800 FT OR 1000 FT AGL. MOST GA ACFT THERE USE 800 FT AGL; AS DID I. IN ANY EVENT; HE WAS EITHER AT THE APPROX TPA BEING USED BY EVERYONE THAT DAY; OR WAS ABOUT 190-195 FT BELOW THE 'OFFICIAL' 1000 FT TPA. EITHER WAY; IT WAS A DANGEROUS MANEUVER. I RECOMMEND THAT PRACTICE ILS APCHS BE PROHIBITED WHENEVER RWY 9/27 IS THE FAVORED AND ACTIVE RWY.