NMAC BTWN AN EXPERIMENTAL PITTS S2B DSNDING TO ENTER THE DOWNWIND LEG; AFTER TWR CLOSING TIME; AND A SINGLE ENG CESSNA CLBING OUT AFTER TKOF. EVASIVE ACTION UNKNOWN SINCE THE OTHER ACFT CALLED OUT THAT RPTR WAS SIGHTED ABOVE HIM. RPTR THEN SPOTTED THE OTHER ACFT PASSING BELOW HIM.

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SFF TWR CLOSED XX00 LCL. TWR FREQ IS CTAF. AT XX10; I CALLED ON CTAF 'FELTS TFC PITTS SMA #1 (THAT'S A FARM STRIP 5 MI N OF SFF); PLANNING R DOWNWIND RWY 21R.' I PROCEEDED SW AND DSNDED FOR ENTRY TO DOWNWIND. AT ABOUT 3 NM OUT; I HEARD '(UNKNOWN) SMA #2.' THEN HEARD 'SMA #3 ON XWIND.' I ANNOUNCED THAT I WOULD BE XING ESMERALDA (A GOLF COURSE) ENRTE TO R DOWNWIND; AND ASKED SMA #3 HIS POS. HE SAID TURNING R DOWNWIND. AT 2 NM OUT I ANNOUNCED AT ESMERALDA AND ASKED SMA #3 WHERE HE WAS ON DOWNWIND. HE SAID MID-FIELD. I WAS LOOKING FOR HIM AND FIGURING OUT HOW TO STAY BEHIND; AS I KNEW I WAS FASTER AND I DIDN'T WANT TO FLY AN EXTREMELY WIDE PATTERN. AS I SPOTTED SMA #3 ON DOWNWIND; I HEARD 'TFC AT FELTS; SMA #2; YOU'RE RIGHT ABOVE US.' I LOOKED L AND DOWN AND SAW A HIGH WING CESSNA ABOUT 250 FT BELOW (I WAS AT 3000 FT PATTERN ALT; ARPT IS 1953 FT MSL) AND OPPOSITE DIRECTION. I SAID 'THAT WAS SMA #1 ABOVE YOU.' THERE WAS ONE OTHER ACFT WELL BEHIND ME; ALSO APCHING SFF; SO THERE WAS SOME RADIO CHATTER AS WE ALL TRIED TO FIGURE OUT WHERE THE TFC WAS. RESULT: WOULD BE BETTER FOR ME TO APCH DOWNWIND OVER FANCHER HILL TO AVOID DEPARTING TFC. BUT; I WAS TRYING TO GET WELL BEHIND SMA #3; AND THE TWRS ON FANCHER HILL DO LOOK CLOSE. SMA #2 COULD HAVE ANNOUNCED HIS POS BETTER.