SMA HAS CONFLICT WITH SKYDIVER ON ENTERING TFC PATTERN.

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APCHING ZPH VFR; DAY; TO LAND. WAS ADVISED BY TPA APCH REGARDING PARACHUTE ACTIVITY IN AREA AND FIELD IS LISTED AS SUCH IN ARPT FACILITIES DIRECTORY. CALLED UNICOM 10 MI OUT; RPTED POS AND INTENTION; REQUESTED LNDG ADVISORY. WAS TOLD 'RWY 22.' OBSERVED ACFT DEPARTING RWY 36. DECIDED TO CIRCLE AROUND FIELD TO OBSERVE FOR TFC AND POSSIBLE 'CHUTISTS.' I THEN OBSERVED THEM -- SEVERAL -- AHEAD AND ABOVE ME. I DSNDED BELOW THEM FURTHER AND TURNED AWAY AND THEN LANDED. ANOTHER COMMERCIAL CFII PLT WITH ME. THERE WAS NO RADIO WARNING OF JUMPING IN PROGRESS. NOT BY PLT OF JUMP PLANE OR UNICOM OPERATOR. THE PEOPLE ON FIELD SAID SOME PLTS ANNOUNCE JUMPERS; AND SOME DON'T. ON DEPARTING; I HEARD A GARBLED RADIO BROADCAST FROM PLT WITH ACCENT 'JUMPERS AT ZEPH-ILL.' NO ALT INFO. UNICOM FREQ VERY BUSY AND HIS RADIO POOR. I HAVE GOOD RADIOS AND HEADSETS. PROB: FAILURE TO COMMUNICATE. RECOMMEND UNICOM CALLOUTS REPEATEDLY AND CLRLY FROM TIME OF JUMP THROUGH DSCNT. GND BASED PARACHUTE OBSERVER WITH PORTABLE UNICOM UNIT TO XMIT TO ANY TRANSITING ACFT REGARDING STATUS OF JUMP ACTIVITY. CONSIDER A SEPARATE UNICOM FREQ AT ARPTS WHERE JUMPING; SO COMS ARE CLR AND NOT STEPPED ON BY OTHER PLTS AND USE CLR AMERICAN ENGLISH PHRASEOLOGY.