A C182 PLT APCHING LRU HAD NEAR MISS WITH A HELI THAT WAS NOT RPTING POSITIONS ON CTAF.

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I WAS WBOUND FROM WICHITA FALLS TO LRU. AT ABOUT 10 MI OUT I HEARD A HELI CALL IN 10 MI SE. I THEN CALLED IN AND RPTED 10 MI E ALSO. NO OTHER COM WAS HEARD FROM THE HELI. AT 4 MI I CALLED A L BASE FOR RWY 22. THE UNICOM CAME BACK AND SAID RWY 22 WAS CLOSED; SO I RPTED I WOULD USE RWY 26. I CALLED AGAIN ON FINAL. NO RESPONSE FROM ANYONE. AT ABOUT 50 FT; PWR OFF AND AT ALMOST STALL SPD OVER THE NUMBERS A HELI APPEARED ON MY L; JUST SHORT OF THE TXWY. I ASSUMED HE WAS GOING TO LAND OR TAXI DOWN THE TXWY. SECONDS LATER HE CAME RIGHT OVER THE RWY AND TURNED DOWN IT. I WAS SO CLOSE THAT I HAD ONLY A SECOND TO DECIDE TO EITHER PUSH THE PLANE DOWN ONTO THE RWY AND LAND UNDER HIM OR ATTEMPT TO TURN R WITH NO PWR NO ALT NO AIRSPD AND A FULL LOAD. I DID NOT THINK I COULD MAKE SUCH A RADICAL MANEUVER WITHOUT STALLING; SO I WENT UNDER THE HELI. I ALSO YELLED MY INTENTIONS OVER THE RADIO AS SOON AS I KNEW I WAS GOING UNDER HIM. I CONTACTED THE PERSON ON THE RADIO AFTERWARDS AND THEY VERIFIED THAT THERE WAS NO COM FROM THE HELI AFTER THE 10 MI CALL. BUT THEY DID HEAR ME AND HAD TALKED TO ME IN THE PATTERN. I THEN TALKED TO THE NURSE ON BOARD THE HELI AND SHE INFORMED ME THAT THEY HAD BEEN HAVING PROBS WITH THE RADIO ALL MORNING; ALTHOUGH THE PLT WOULD NOT ADMIT IT. I BELIEVE SOMEONE HAD BAD RADIOS. I CHKED MINE OUT EVERY WAY I COULD; BUT FOUND NOTHING. MY PLANE IS A 1998 WITH APPROX 1000 HRS ON IT; WHICH MAKES IT EVEN MORE UNLIKELY TO HAVE A PROB. I ALSO CHKED THE FAR'S AND IF I AM READING THEM RIGHT 91-126 B2; 91-127 A; AND 91-129 F2 ALL STATE THAT HELI'S MUST AVOID THE FLOW OF FIXED WING ACFT AT UNCTLED ARPTS. ALSO 91-119 D MAY APPLY. THIS RPT WAS ALSO GIVEN VIA PHONE TO ZAB AT THE TIME OF THE INCIDENT.