FO OF LGT MADE HARD LNDG DUE TO WIND SHEAR RESULTING IN DAMAGE TO THE TAILSKID; ANTENNA MAST; AND AFT DRAIN.

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LAS ARRS WERE TO RWY 25L; ATIS INFO 'I' INDICATED 92 DEGS-F; WIND CALM; NO CEILING/CLOUD DATA. APPROX 13 MI OUT; AFTER BEING CLRED FOR A VISUAL APCH; WE WERE ASKED TO SLOW TO ALLOW FOR AN L-1011 DEP OFF RWY 7L. APPROX 8-9 MI OUT; WE WERE GIVEN NORMAL SPD; AN APOLOGY; AND TOLD THE L-1011 WAS UNABLE DEP DUE TO TAILWIND. I QUESTIONED THE FE ABOUT ACCURACY OF ATIS INFO AND SUBSEQUENTLY REQUESTED CURRENT WINDS FROM APCH. 220 DEGS/20 KTS; NO MENTION OF GUST. WHILE CONFERRING WITH THE FE ABOUT WIND INFO; THE FO NOTICED AN AMBER WINDSHEAR ALERT (FLASHING). WE DECIDED TO ADD 5 KTS TO OUR TARGET SPD FOR INCREASED MARGIN AND CONTINUED TO MONITOR AIRSPD; VERT SPD; AND TEMPS. NO ADDITIONAL WINDSHEAR ALERTS OR ANY ABNORMALS/DEVS WERE NOTICED OR ENCOUNTERED UNTIL THE LNDG FLARE. OUR ORIGINAL LNDG CLRNC TO RWY 25L WAS CANCELED AND CLRED TO LAND RWY 25R. HOLD SHORT OF RWY 19L. (CHANGE OCCURRED 3-4 MI OUT). ENGS WERE STILL SPOOLED UP AT ONSET OF FLARE; WE WERE FULLY CONFIGURED AND STABLE. NEITHER THE FE OR MYSELF NOTICED ANY DEVS AT 100 FT OR 50 FT AFL. AT ABOUT 30 FT AFL. I NOTICED AN INCREASE IN SINK RATE FOR WHICH THE FO HAD ADDED PWR. CHKING AIRSPD I FOUND IT DECREASING RAPIDLY BELOW REF AND VERT SPD ACCELERATING TO GREATER THAN 1000 FPM DOWN. I DID NOT CALL OUT THE SPD DEV SINCE THE FO HAD ALREADY APPLIED PWR. I DID CALL OUT 'SINK' FOR WHICH HE ROTATED TO AN ESTIMATED 12-15 DEGS NOSE UP. VERT DSCNT CONTINUED TO INCREASE WITH TAIL SECTION OF ACFT CONTACTING RWY AT OR NEAR 1000 FT MARK. ACFT DID NOT APPEAR TO BOUNCE. ROLLOUT AND TAXI TO GATE WERE NORMAL. WINDSHEAR INOP LIGHT WAS ILLUMINATED AFTER LNDG (POSSIBLE DURING FINAL APCH AS WELL). THERE WERE NO KNOWN PAX INJURIES. DAMAGE TO ACFT TAILSKID; #3 VHF ANTENNA; AFT DRAIN MAST. IRONICALLY; WE HAD REVIEWED WIND SHEAR ALERTS AND PROCS ENRTE. GND PERSONNEL TOLD US THAT WINDS WERE CALM JUST MINS PRIOR TO OUR ARR. SEQUENCE RPT INDICATED VIRGA IN THE AREA. THE FLASHING AMBER WIND SHEAR ALERT INDICATED 'INCREASING PERFORMANCE;' NOT DECREASING. WHILE I DIDN'T NOTICE ANY DEVS IN THE APCH/INITIAL LNDG FLARE; THE SIDESTEP MANEUVER; A DEP PRIOR TO OUR LNDG AND TUNING THE ILS FREQ (DUE TO RWY CHANGE) TO ELIMINATE GS ANNOUNCEMENT WERE DISTRS.