IMPROPER COM PROCS CAUSE LOSS OF SEPARATION. IMPROPER TFC PATTERN PROCS.

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WE WERE PRACTICING SOME TOUCH AND GOES AT R TFC PATTERN AT RWY 35. THEN LEFT ABOUT 15 MINS TO SHOOT ILS APCHS AT FORT CAMPBELL (HOP). AFTER COMPLETING THE APCH; WE ASKED CAMPBELL CTLR TO RETURN TO OUTLAW FIELD. AFTER RADAR SVC WAS TERMINATED; WE CALLED THE UNICOM TO TELL OUR INTENTION. AT APPROX 5 MI NE OF OUTLAW FIELD. THEN WE JOINED R DOWNWIND RWY 35; AND WE DIDN'T RECEIVE ANY RADIO WHILE WE WERE APCHING. THEN WE FOUND 1 AIRPLANE FLEW ABOVE US. BUT WE WERE NOT SURE THAT AIRPLANE IS DEPARTING OR APCHING. WE TRIED TO LOOK FOR THAT AIRPLANE; BUT TO LOOK DIRECT BACKWARD WAS NOT SO EASY. SO; WE TURNED TO BASE TO FINAL MAINTAINING TFC PATTERN ALT. DURING THIS MANEUVER; NO RADIO CALLS WERE COMING. WHEN WE TRIED TO TURN TO FINAL; WE FOUND THE AIRPLANE ON THE RWY; SO WE DID GAR. AND THE SAME TIME; THE AIRPLANE CALLED 'WE'RE USING RWY 17 NOW.' IT WAS HIS FIRST CALL DURING THIS HAPPENING. SO WE CALLED RADIO TO DEPART THE TFC PATTERN AND RE-ENTER THE L TFC PATTERN FOR RWY 17 AND LAND. ON THAT TIME; BEFORE ENTERING THE TFC PATTERN; WE CHKED WINDSOCK AND THE UNITED STATES FLAG IN FRONT OF THE TERMINAL BUILDING WHICH SHOWS LIGHT WIND FROM N. AND BEFORE AND AFTER THIS PERIOD; OUR ARPT WERE USING RWY 35.