AFTER DEPARTURE THE PLT MADE 3 PRACTICE ISL APCHS AT BRADFORD REGIONAL ARPT LOCATED 35 MLS AWAY. THE ACFT RETURNED TO WELLSVILLE AND WAS CLEARED FOR RWY LOCALIZER APCH. THE PLT RADIOED WELLSVILLE UNICOM FOR ADVISORIES AND WAS INFORMED THAT A FOG BANK WAS OVER THE APCH END OF RWY 28 WITH A 1/4 MI VISIBILITY. THE PLT ACKNOWLEDGED AND ABOUT 5 MINS LATER A ELT SIGNAL WAS RECEIVED AT THE ARPT. ANOTHER PLT MADE THE APCH ABOUT 30 MINS LATER. ACCORDING TO THE PLT DURING THE APCH HE COULD SEE DIRECTLY BELOW BUT WAS UNABLE TO SEE THE ARPT. HE MADE A MISSED APCH AND LATER LANDED AFTER A 2ND APCH. THE ACFT COLLIDED WITH TREES ABOUT 1/4 MI FROM THE APCH END OF RWY 28. EXAMINATION OF THE ACFT DID NOT DISCLOSE EVIDENCE OF MALFUNCTION. THERE WAS NO EVIDENCE OF PILOTS' PHYSICAL IMPAIRMENT OR INCAPACITATION. FLIGHT TEST DETERMINED SATISFACTORY OPERATION OF THE LOC NAVAIDS.