DISTRS DURING AN INST APCH TO GROTON; CT; LEAD TO A TWR ORDERED GAR DURING THE LNDG GLARE BECAUSE THE LNDG GEAR IS NOT DOWN.

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IN IMC; WE WRE BEING VECTORED FOR THE ILS RWY 5 APCH AT GROTON; CT. AT A DISTANCE OF 10 NM FROM THE FIELD; WE WERE EXPECTING A DSCNT TO A LOWER ALT. WE WERE JUST ABOUT TO ASK FOR A DSCNT WHEN ATC INSTRUCTED US TO CLB TO 5000 FT. THIS WAS TO KEEP US CLR OF ACFT IN THE HOLDING PATTERN WAITING TO SHOOT THE APCH. ON THE DOWNWIND LEG; ATC CLRS US TO 3000 FT AND BEGINS VECTORING US FOR THE APCH. AS WE WERE DSNDING; THE PF CALLED FOR THE APCH CHKLIST. AS WE FINISHED THIS CHKLIST; WE WERE CLRED TO 2500 FT AND VECTORED FOR THE BASE. BEFORE WE COULD FINISH THE TURN TO HDG; WE RECEIVED A FURTHER VECTOR TO INTERCEPT THE FINAL APCH COURSE AND A DSCNT TO 2000 FT. WE WERE CLRED FOR THE ILS RWY 5; BUT RECEIVED NO INSTRUCTIONS TO CONTACT THE TWR. ALSO; WHILE ON BASE; THE PF DISCOVERED THAT THE GS WAS INOP. THE VECTOR FOR THE FINAL APCH COURSE PUT US VERY CLOSE TO THE FAF. WE CALLED ATC AND ASKED FOR A FREQ CHANGE. AS WE WERE GOING PAST THE FAF; A FREQ CHANGE WAS APPROVED. APPROX 1 MI FROM THE FAF; WE TRIED TO CONTACT TWR ON THE #2 COM; WHICH HAD BEEN WORKING PRIOR TO OUR DEP; BUT WE WERE UNABLE. WE TRIED #1 AND STILL NOTHING. IT WAS DURING OUR FIRST ATTEMPT AT REACHING THE TWR THAT WE RPTED THE GS FAILURE. THE PF AT THIS POINT BECAME AWARE OF OUR COM PROB. WE DID EVENTUALLY; AFTER SEVERAL ATTEMPTS ON BOTH RADIOS; REACH THE TWR AND RECEIVED OUR CLRNC TO LAND. DUE TO THE DIVERSION OF ATTN; HOWEVER; THE FINAL APCH CHKLIST WAS NOT CALLED FOR. WE WERE ON THE APCH AND DID NOT HAVE THE LNDG GEAR DOWN. DURING THE LNDG FLARE; THE TWR INSTRUCTED US TO GO AROUND BECAUSE OUR GEAR WAS NOT DOWN. THE PF INITIATED THE GAR PROC IMMEDIATELY. THE TWR INSTRUCTED US TO FLY THE PUBLISHED MISSED AND TO CONTACT PVD APCH. UPON REACHING PVD APCH; WE RECEIVED VECTORS BACK TO THE FINAL APCH COURSE. WHILE BEING VECTORED TO THE BASE LEG; WE AGAIN EXPERIENCED RADIO COM FAILURE. THE #1 COM AGAIN APPEARED TO FAIL. WE TRIED #2; AND AFTER A FEW ATTEMPTS; RESUMED CONTACT WITH ATC. PRIOR TO THIS RESUMPTION OF COMS; APCH INSTRUCTED US TO IDENT IF WE COULD HEAR THE INSTRUCTIONS; WHICH WE WERE ABLE T COMPLY WITH. THE SECOND APCH WAS UNEVENTFUL. ALL CHKLISTS WERE CALLED FOR AND COMPLETED. UPON REFLECTION; THE PF'S ATTN TO THE RADIO PROB CAUSED HIM TO NOT CALL FOR THE FINAL APCH CHKLIST WHICH HAD THE GEAR DOWN CALL. MY ATTN TO THE RADIO PROB CAUSED ME NOT TO GIVE THE PF THE FINAL APCH CHKLIST. WE SHOULD NOT HAVE ALLOWED OUR INABILITY TO GET THE TWR AND RECEIVE A CLRNC TO LAND TO DISTRACT US. WE SHOULD HAVE SIMPLY INITIATED THE MISSED APCH PROC. SUPPLEMENTAL INFO FROM ACN 577535: MY ATTN TO THE RADIO PROB CAUSED ME TO DIVERT MY ATTN AND NOT CALL FOR THE FINAL APCH CHKLIST. I SHOULD HAVE WENT MISSED SO I COULD TROUBLESHOOT THE PROB.