AN A319 FO RPT ON COM PROBS; LOSS OF COM FREQ; ON 121 PT 80 WITH ATC BLEED OVER AND DEAD SPOTS NOTED ON TXWY E; N OF E-12 AT CLT; NC.

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APCHING TAXI SPOT X WE SWITCHED FROM RAMP CTL TO GND FREQ 121.8. THERE WAS QUITE A BIT OF 'BLEED-OVER' FROM ANOTHER FREQ BUT WE CALLED GND AND UNDERSTOOD WE WERE CLRED TO TAXI TO RWY 18R. AFTER ENTERING TXWY 'E' THE BLEED-OVER GOT SO BAD WE AGAIN CALLED GND TO VERIFY CLRNC. WE GOT NO RESPONSE AFTER MULTIPLE CALLS SO WE SWITCHED TO TWR. TWR THEN SENT US OVER TO GND FREQ 121.9 WHICH WAS A CLR FREQ WITH NO PROBS. THIS PARTICULAR AREA OF THE ARPT AND FREQ 121.8; HAS HAD PROBS FOR YEARS. I WOULD SUGGEST A STUDY INTO ANTENNA PLACEMENT OR A POSSIBLE CHANGE TO A GND FREQ WHICH DOESN'T CONFLICT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: FO RPTR STATED THAT THIS SIT HAS EXISTED FOR WELL OVER 2 YRS. THE A319 TOP ANTENNA IS USED FOR GND COM. HE MENTIONED THAT JUST ABOUT ANY PLT THAT FLIES INTO CLT KNOWS OF THIS PROB. A 'COMMON PROB FOR EVERYONE.' THE BLEED OVER APPEARS TO BE FROM A CLT APCH CTL FREQ. HE DID NOT KNOW IF THE PROB HAS ADDRESSED WITH ATC. THERE IS AN ANTENNA FIELD W OF THE RWY 18R AREA DIRECTLY ACROSS FROM SPOT X; ABOUT 200 YDS AWAY. SUPPLEMENTAL INFO: A TWR SPECIALIST ADVISED THAT THIS ISSUE HAS BEEN DISCUSSED WITH ARPT PERSONNEL. THE PROB WAS FORWARDED TO AIRWAYS FACILITIES. INTERFERENCE IS THOUGHT TO BE CREATED BY THE SECOND HARMONIC OF THE ATIS. STAFF INDICATED THAT THERE ARE NO MORE FREQS AVAILABLE; SO NO NEW FREQ CAN BE ALLOCATED. THEY ARE CONSIDERING A STUDY OF SWITCHING FREQS TO ALLEVIATE THE PROB.