THE ACFT IMPACTED TREES DURING A PRECAUTIONARY LNDG DUE TO THE PLTS EST OF A LOW FUEL STATE. THE FLT HAD PROCEEDED R ENROUTE TO AN INTENDED DEST OF OXFORD ME FROM FREDERICK MD WITHOUT FILLING A FLT PLAN. AFTER APRX 3 HRS OF FLYING ON A 60 DEGREE MAG HDG THE PLT DECIDED TO DESCEND THROUGH THE CLOUD DECK TO LOOK FOR AN ARPT TO REFUEL OR A FIELD FOR A PRECAUTIONARY LNDGING DUE TO LOW FUEL STATE. THE DESCENT WAS MADE FROM 9500 FT TO 3500 FT FINALLY IN DETERIORATING WX. CLARYVILLE NY WAS CIRCLED A FEW TIMES IN AN ATTEMPT AT ORIGINATION. THE PLT NEVER USED THE RADIO,HE SAID.TO TRY FOR 2 WAY COMMUNICATION FOR NAV AID. AN ATTEMPT TO LAND IN A FIELD NW OF CLARYVILLE ENDED IN AN OVERSHOOT & ATTEMPTED GO-AROUND BEFORE FLYING UNDER WIRES & STRIKING TREES. THE ACFT WAS IMPALED ABOUT 12 FT AGL. THE PLT STATED THAT HE NEVER CONSIDERED MAKING A 180 DEGREE TURN DURING THE DETERIORATING WX EVEN THOUGH HE WAS UNSURE OF HIS POSITION WHEN STARTING THE DESCENT FROM 9500 FT. ONE WING TANK WAS RUPTURED IN THE CRASH & THE PLT COULD NOT EST FUEL REMAINING.