Narrative:

In the preflight briefing, mia FSS told us that the CTAF had changed to 128.825. Once center passed us off on the approach we self-announced on the new CTAF. Once we were on the ground, a white van chased us down and called us over the radio telling us that 128.825 was the unicom frequency and CTAF was 128.5. So we switched over and self-announced on CTAF. The van then proceeded to ask us what type of aircraft we were and took down the tail numbers. Callback conversation with reporter revealed the following information: reporter did not add any additional information except that he thought it was bizarre that the unicom operator did not say anything to him about being on the incorrect frequency while he was inbound making his announcements.

Related reports:

Google
 

Original NASA ASRS Text

Title: SPECIALIST AT MIA FSS MAY HAVE GIVEN AN INCORRECT CTAF FREQ TO A PLT FLYING INTO APF ARPT.

Narrative: IN THE PREFLT BRIEFING, MIA FSS TOLD US THAT THE CTAF HAD CHANGED TO 128.825. ONCE CTR PASSED US OFF ON THE APCH WE SELF-ANNOUNCED ON THE NEW CTAF. ONCE WE WERE ON THE GND, A WHITE VAN CHASED US DOWN AND CALLED US OVER THE RADIO TELLING US THAT 128.825 WAS THE UNICOM FREQ AND CTAF WAS 128.5. SO WE SWITCHED OVER AND SELF-ANNOUNCED ON CTAF. THE VAN THEN PROCEEDED TO ASK US WHAT TYPE OF ACFT WE WERE AND TOOK DOWN THE TAIL NUMBERS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR DID NOT ADD ANY ADDITIONAL INFO EXCEPT THAT HE THOUGHT IT WAS BIZARRE THAT THE UNICOM OPERATOR DID NOT SAY ANYTHING TO HIM ABOUT BEING ON THE INCORRECT FREQ WHILE HE WAS INBOUND MAKING HIS ANNOUNCEMENTS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.