ACR X NON ADHERENCE TO ATC CLRNC VISUAL APCH MADE ILS APCH DSCNT BELOW GLIDEPATH TRACK DEV MISSED ANTENNA BY 200 FT VERT AND 1500 FT HORIZ. PLTDEV.

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I WAS WORKING APCH/TWR COMBINED IN THE TWR; ALONE. TFC WAS VERY LIGHT. ACR X WAS INBOUND FROM THE NW. I HAD ISSUED A DSCNT CLRNC TO 1800 FT AND HAD THE ACFT ON A HDG FOR A 5 MI BASE. BTR ARPT IS EXTREMELY HARD TO SEE AT NIGHT; AND SEVERAL TIMES; ACFT HAVE LINED UP ON FINAL TO HWYS RATHER THAN THE RWY. AFTER I 'FLASHED' THE RWY LIGHTS AT ACR X; THE PLT STATED HE SAW THE ARPT; AT WHICH TIME I CLRED HIM FOR A VISUAL APCH TO RWY 22R; ALSO CLRED HIM TO LAND. AFTER RECEIVING AN ACKNOWLEDGEMENT; I WALKED TO THE OTHER SIDE OF THE CAB TO EXAMINE SOME MATERIAL THAT HAD PRINTED ON THE FLT STRIP PRINTER. ACR X ASKED IF I WOULD FLASH THE RWY LIGHTS AGAIN; AT WHICH TIME I LOOKED UP AT THE D-BRITE AND NOTICED ACR X WAS AT 1100 FT; 5 MI FROM THE ARPT IN A TURN TO THE SW. I ISSUED A CLB CLRNC TO 1800; AND A VECTOR TO 090. THE ACFT KEPT DSNDING AND TURNING. ACR X WAS HEADED RIGHT TOWARD AN ANTENNA STILL DSNDING. I TOLD THE ACFT 'CLB AND MAINTAIN 1800 IMMEDIATELY; 700 FT ANTENNA; 12 O'CLOCK; 1/2 MI.' I LOOKED OUT THE WINDOW AND OBSERVED ACR X PULL UP QUICKLY. I THEN VECTORED THE ACFT FOR AN ILS APCH. AFTER TALKING TO THE PLT; IT APPEARED HE HAD RECEIVED A 'PHANTOM' SIGNAL ON THE ILS. SINCE THIS COMPANY USES THE ILS TO BACKUP A VISUAL APCH; THE PLT SAW THE NEEDLES COME ALIVE AND STARTED FOLLOWING THEM; TRUSTING THE NEEDLES INSTEAD OF HIS EYES. WE'VE ALL BEEN TAUGHT TO TRUST THE INSTS; WELL THIS TIME IT ALMOST CAUSED A DISASTER. FROM THIS POINT ON; I WILL VECTOR EVERYBODY TO THE ILS FINAL AT NIGHT AND ENSURE THEY ARE ON COURSE BEFORE DIVERTING MY ATTN TO OTHER DUTIES WITHIN THE CAB.