FLC OF B737-300 EXPERIENCES FLAGS ON THE ILS INSTS DURING AN IMC APCH. EXECUTING THE MISSED APCH THEY RECEIVE A CLRNC TO REMAIN BELOW THE MISSED APCH ALT DUE TO AN ACR ON THE INBOUND FOR THE SAME APCH AT THE SAME ALT.

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WE WERE ON AN ILS APCH IN IMC JUST INSIDE OF SAKER INTXN TO THE JACKSON HOLE; WY; ARPT. AT THIS POINT I WAS FLYING THE APCH WHEN I GOT THE ILS GS AND LOC FLAGS. I ASKED THE COPLT IF HE HAD LOST HIS ILS GUIDANCE; TO WHICH HE SAID YES. I THEN CALLED MISSED APCH; CONFIGURED THE ACFT AND HAD THE FO CALL CTR THAT WE HAD MISSED THE APCH. THE MISSED APCH ALT IS 15000 FT MSL. WE WERE CLBING TO THAT ALT WHEN WE CONTACTED ATC. ATC THEN TOLD US TO LEVEL OFF AT 14000 FT DUE TO ANOTHER ACFT ON THE OUTBOUND LEG OF THEIR APCH AT 15000 FT. WE POPPED OUT OF THE CLOUDS ABOUT 13500 FT TO SEE ANOTHER ACFT GO RIGHT ABOVE US AT 15000 FT IN THE OPPOSITE DIRECTION. HAD WE NOT CALLED ATC IN SUCH A TIMELY FASHION; THIS COULD HAVE BEEN A BAD DEAL. WHEN THE INITIAL OUTBOUND APCH AND MISSED APCH ARE PUBLISHED AT THE SAME ALT; THERE IS THE POSSIBILITY OF A CONFLICT. HAD OUR COMPANY NOT RECENTLY PUBLISHED A HEADS UP ON THIS FACT; AND GIVEN THE VERY BUSY NATURE OF A MISSED; I MAY HAVE NOT CALLED ATC SO SOON; WHICH COULD HAVE BEEN HAZARDOUS. I HAVE ADDED ANOTHER FEATURE TO MY NON CTLED ARPT PROCS -- EXECUTE THE MISSED AND IMMEDIATELY CALL ATC. THIS WORKED ONLY BECAUSE WE TALKED TO CTR AND I HOPE OTHERS WILL TOO. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE FILED A RPT WITH HIS CHIEF PLT AND CALLED THE OPS DEPT TO ASSURE HE WAS FOLLOWING THE PROC PROPERLY. HE WAS TOLD THAT 'YOU OWN THAT SPACE WHEN ON A MISSED APCH.' SO IT APPEARS THAT THE ALT FOR BEGINNING THE APCH OUGHT TO BE AT 16000 FT AND THE MISSED APCH REMAIN AT 15000 FT -- AT A NON TWR ARPT ESPECIALLY. THIS WOULD SEPARATE TFC DURING THE TRANSITION FOR BOTH THE APCH AND THE MISSED. IT IS JUST A BAD SIT TO HAVE BOTH FLT PATHS AT THE SAME ALT. WITHOUT THE NAV GUIDANCE THEY WERE QUICK TO TUNE IN THE VOR FOR SOME HELP AND WERE VECTORED AROUND FOR A LNDG. RPTR STATES THAT HE HAS HAD SIGNAL INTERRUPTIONS BEFORE; BUT USUALLY FURTHER OUT ON THE APCH.