CARGO ACFT HAS INTERMITTENT DME. RPTS POS BY 'GUESS;' CLRED TO DSND BEFORE REACHING INTXN.

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DURING THIS SEGMENT OF THE FLT; EVEN THOUGH THE MIN RECEPTION ALT IS 11400 MSL; THE DME GOES OFF AND ON AND OFF CONSTANTLY AT 13000 MSL. I WAS TOLD TO RPT POMAC INTXN SO I COULD DSND TO 11000 MSL; AND THEN THE DME GOES OUT DUE TO BAD RECEPTION IN THIS AREA. I ESTIMATED POMAC BEST I COULD AND RPTED POMAC. THEN THE DME COMES BACK ON AT 22 DME AND APCH ASKED MY POS. I TOLD THEM 22 DME AND THEY SAID I ALREADY RPTED POMAC AND WAS CLRED TO 11000. THEY TRIED TO TELL ME 'POMAC WAS 20 DME AND FORTUNATELY IT WAS GOOD VFR.' RATHER THAN TRY TO EXPLAIN OVER THE RADIO; I JUST AGREED WITH THEM AND CONTINUED INTO MSO. I COULD NOT RECEIVE DRUMMOND VOR FOR A POSITIVE FIX FOR POMAC; EITHER. RECEPTION IN THIS AREA IS BAD ALL AROUND. FOR ANOTHER EXAMPLE; NOT ASSOCIATED WITH THIS RPT; IS THE FACT THAT AT KETCH INTXN OFF THE DRUMMOND VOR; 103 DEG RADIAL AT 26 DME; I CANNOT RECEIVE DRUMMOND VOR AT 12000 MSL TO IDENT KETCH. 'JUST WAIT UNTIL THE BTM ILS COMES IN AND YOU'RE AT KETCH;' OTHER PLTS HAVE TOLD ME. THE EQUIP IN MY PLANE IS GOOD. THEY ARE NEW SMT'S HAULING COMMERCIAL COMPANY CARGO AND MAINTAINED VERY WELL. I CHANGE FROM 1 PLANE TO ANOTHER; AND ALL OUR SMT'S HAVE RECEPTION PROBLEMS IN THIS AREA.