A B738 CREW EXPERIENCED EXCESSIVE LOCALIZER DEVIATION WHILE FLYING A 'VFR' ILS TO RWY 9 LEFT AT MIA.

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I BELIEVE THERE IS A PROBLEM WITH THE RWY 9L LOC AT MIA. I HAVE MADE SEVERAL OF THE APPROACHES IN THE LAST FEW WEEKS AND HAVE NOT BEEN ABLE TO GET AN ACCEPTABLE SIGNAL. I HAVE MADE SEVERAL COMMENTS TO ATC AND I BELIEVE IT HAS NOT BEEN AN ACFT OR PILOT INDUCED PROBLEM. I HAVE GOTTEN AN EXCESS DEV ANNUNCIATION ON THE HUD EVERY TIME I HAVE ATTEMPTED TO USE THE HUD ON ONLY THIS RWY. BELOW 500 FT THE LOCALIZER GOES EVERY WHICH WAY BUT LOOSE. I HAVE NOT WRITTEN UP THE PROBLEM PRIOR TO THIS BECAUSE I WAS UNCERTAIN IF I HAD BEEN THE CAUSE OF THE PROBLEM. NOW I AM SURE THE PROBLEM IS GROUND BASED. IF THE WEATHER WAS IMC AT MIA - I WILL NOT ACCEPT A LOW VISIBILITY RWY 9L ILS. THANKS. CALLBACK CONVERSATION WITH REPORTER REVEALS THE FOLLOWING INFO: RPTR STATED; HE IS GETTING THE WORD OUT TO HIS FELLOW CREW MEMBERS ABOUT HIS EXPERIENCES WITH THE RWY 9L ILS LOC. HE REITERATED THAT THE DEVIATION OCCURRED WHETHER ACFT WERE MOVING ON THE ARPT OR NOT; I.E. ILS CRITICAL AREA. HE ALSO STATED; HE WOULD NOT ACCEPT A LOW VISIBILITY RWY 9L ILS APPROACH. ATC; WHEN ADVISED OF THE DEVIATIONS SEEMED UNAWARE OF A PROBLEM; BUT WOULD CHECK INTO IT.