CLT APCH CTLR CLAIMS RADAR EQUIP BELOW 7000 FT IN CERTAIN AREA IS VERY POOR.

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THERE WERE NO ACFT-TO-ACFT CONFLICTS. I WAS WORKING SATELLITE RADAR. I COULD NOT TRACK ACFT FROM CLT 080 DEG RADIAL THROUGH CLT 250 DEG RADIAL AT OR BELOW 7000 FT DUE TO VERY POOR RADAR PRESENTATION. ONGOING -- GETTING WORSE. PRIMARY AND SECONDARY RADAR WOULD DROP OFF MID RADAR SWEEP AT ITS BEST. I ADVISED THE ATC SUPVR AND HE SWITCHED TO SECOND CHANNEL WITHOUT ANY IMPROVEMENT. ATC SUPVR CALLED RADAR TECHNICIAN SUPVR. RADAR TECHNICIAN SUPVR SAID WITH LACK OF CONCERN THAT THERE WASN'T ANYTHING SHE COULD DO FOR 4 HRS UNTIL A RADAR TECHNICIAN CAME TO WORK. THIS IS AN ONGOING PROB WE WORK WITH SINCE OUR ONLY OTHER CHOICE IS CENRAP. WE NEED HELP FROM A HIGHER LEVEL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THE RADAR ANTENNA WAS TILTED SLIGHTLY TO ELIMINATE A RING AROUND PROB. RPTR STATED THE RADAR ANTENNA WAS TILTED SLIGHTLY TO ELIMINATE A RING AROUND PROB. RPTR SAID AS A RESULT OF THE TILTING; RADAR COVERAGE IN CERTAIN AREAS IS VERY POOR AND ACFT TARGET LOSS IS COMMON AT THE LOWER ALTS. HE SAID THE RADAR TECHNICIANS ARE NOT ABLE TO CORRECT THE PROB. HDOFS TO AND FROM OTHER FACILITIES ARE SOMETIMES A PROB. HE SAID UCR'S UNSATISFACTORY CONDITION RPT HAVE BEEN FILED SEVERAL TIMES BY CTLRS.