PLT OF SMA ON TRAINING XCOUNTRY FLT MISUNDERSTOOD THAT IXD TWR WAS CLOSED; USED WRONG FREQ; LANDED WITHOUT CLRNC.

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I ATTEMPTED TO CONTACT THE IXD TWR ON 118.9. I HAD COPIED THIS FREQ FROM THE ARPT FACILITY DIRECTORY. I AM NOW AWARE THAT 118.9 IS THE FREQ FOR KANSAS CITY APCH/DEP CTL; NOT IXD TWR; WHICH IS 118.3. I RECEIVED NO RESPONSE ON THIS FREQ. UNDER THE ASSUMPTION THAT IXD TWR WAS NOW CLOSED; I BEGAN MAKING COMMON TA FREQ (CTAF) POS RPTS ON 118.9. I ENTERED A L DOWNWIND FOR RWY 22 WHICH WAS ILLUMINATED AND MADE A NORMAL LNDG GIVING POS RPTS ON DOWNWIND; BASE; AND FINAL APCH. AS I TAXIED OFF OF THE RWY THE TAXI LIGHTS WENT OFF. FROM MY POS ON THE TAXIWAY I COULD THEN SEE THE HEADLIGHTS OF AN APCHING VEHICLE ON THE RWY. I WAITED FOR THE VEHICLE WHICH PULLED UP NEXT TO MY ACFT. AS THE DRIVER EXITED HER VEHICLE I STOPPED MY ENG. THE DRIVER INSTRUCTED ME TO CONTACT GND CTL ON 124.3 AND THAT TWR FREQ WAS 118.3. I THEN CONTACTED GND CTL WHO INFORMED ME THAT THE IXD TWR WAS OPEN; AND THAT I HAD ENTERED THE ATA AND LANDED WITHOUT CLRNC. AFTER INFORMING ME OF MY ERROR THE CTLR ASKED ME WHAT MY INTENTIONS WERE. I INFORMED THE CTLR THAT I WANTED PROGRESSIVE TAXI INSTRUCTIONS AND CLRNC FOR AN EASTERN DEP. I WAS THEN INSTRUCTED TO BACK TAXI ON RWY 22 FOR DEP. AFTER BACK TAXI I CONTACTED TWR ON 118.3 AND WAS GIVEN CLRNC FOR EASTERN DEP AND TKOF. I THEN DEPARTED AND RETURNED TO 9K4.