THE PLT OF N45945 STATED THAT UPON ENTERING DOWNWIND FOR RWY 32 SHE REPORTED HER POSITION ON UNICOM BUT DID NOT RECEIVE A REPLY. SHE CONTINUED HER APPROACH FAILING TO REPORT BASE AND FINAL POSITIONS. AT APRX 500 FT ON FINAL APCH SHE FELT THE AIRCRAFT BUFFET AND CAUGHT A GLIMPSE OF SOMETHING OUT OF THE CORNER OF HER LEFT EYE. SHE CONTINUED AND LANDED WITHOUT INCIDENT. THE PLT OF N2773U STATED THAT HE CALLED ON 122.8 PRIOR TO ENTERING THE PATTERN AT THE ARPT. HE USED THE WRONG UNICOM FREQ AND DID NOT GET A REPLY. HE CONTINUED TO THE ARPT AND OBSERVED THE WINDSOCK INDICATING RWY 32 WAS BEST. HE ENTERED DOWNWIND AND REPORTED HIS POSITION, AGAIN ON THE WRONG FREQ. AFTER TURNING FINAL HE FELT A BUMP IN THE ACFT & SAW ANOTHER ACFT TO HIS UPPER RT. HE BROKE OFF HIS APCH AND REENTERED THE PATTERN, LANDING WITHOUT INCIDENT. IT WAS NOT DETERMINED THAT THE ACFT HAD COLLIDED UNTIL APRIL 11, 1984 WHEN TIRE MARKS AND RT WING DAMAGE WAS FOUND ON N2773U DURING AN INSPECTION. N45945 WAS NOT DAMAGED.