OFF ILS LOC AT MINIMUMS ELECTED TO CIRCLE LAND AT 500 FT AGL.

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ON IFR FP GTF-GEG ABOUT XA30 LCL ESTIMATED TIME ENRTE 1 PLUS 30 HAVING ARRIVED ABOUT AN HR EARLIER FROM STP. GOT UP EARLY FOR AN EARLY START BUT GOT FRUSTRATED BY LAST MIN PHONE CALLS AND DEP PREPARATIONS. FLEW STP TO GTF AT 16000 FT (4 PLUS 30 ENRTE). WHEN ZLC HANDED ME OFF TO GET APCH CTL I OBSERVED THAT THE GYROSCOPE COMPASS AND MAGNETIC COMPASS DIDN'T AGREE. RPTED DISCREPANCY TO APCH CTL WHO SUGGESTED NO-GYROSCOPE APCH WHICH I GRATEFULLY ACCEPTED. TUNED LORAN TO RWY AS BACKUP AND WAS CLRED FOR ILS 3 AND TO CALL TWR WHEN ESTABLISHED. I CALLED TWR WHEN ON LOC AND GS BUT GOT NO ANSWER. ABOUT THEN THE LORAN FLASHED WARNING 'NO RELIABLE SIGNAL.' DOUBLE-CHKED FOR CORRECT TWR FREQ. BROKE OUT ABOUT 500 FT TOO CLOSE TO RWY END. FLEW ALONG RWY STILL CALLING TWR AND ASKING FOR L DOWNWIND TO LAND. TWR CLRED ME TO LAND AND HURRY OFF RWY. AFTER LNDG; GAVE THE AIRPLANE TO RADIO SHOP (THEIR RPT IS ATTACHED). I BELIEVE THE EARLY MORNING RUSH TO GET STARTED; THE LONG DAY OF IFR; THE DRIFTING GYROSCOPE COMPASS; THE CONFUSING MAGNETIC COMPASS READINGS; THE LORAN MISBEHAVIOR; ALL CONTRIBUTED TO A POOR APCH. WHEN I BROKE OUT I COULD HAVE SLIPPED OFF THE EXCESS ALT AND LANDED ON THE 2ND HALF OF THE RWY BUT I DIDN'T EVEN THINK OF THAT. MY ANXIETY TO GET ON THE GND TOOK PRECEDENCE. IN RETROSPECT; I SHOULD HAVE SPENT MORE TIME AT GTF AND RELAXED FOR 1/2 HR OR SO. MY AIRPLANE WAS RECENTLY ANNUALED AND THIS WAS 1ST XCOUNTRY SINCE.