C177 PLT HAD COM PROBS ESTABLISHING CONTACT WITH DWH ATCT. HE THOUGHT THE TWR WAS CLOSED SO HE JUST LANDED AT DWH.

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ONCE I TOOK OFF FROM HUNTSVILLE (TO GO FOR COMMERCIAL TRAINING AT COMPANY X); I REALIZED THAT VISIBILITY WAS GREATLY OBSCURED DUE TO A VERY THICK HAZE. SHORTLY; AFTER TKOF I CALLED ZHU TO GET VFR FOLLOWING. BECAUSE THE VISIBILITY WAS STILL VFR; BUT MARGINAL; THE CTLR TOLD ME TO CONTACT HOOKS 118.40; SO I CALLED UP AND RECEIVED NO ANSWER. NEXT TIME I TRIED ANOTHER FREQ; AND STILL NO RESPONSE. A WEEK BEFORE I HAD COME IN BEFORE XA00 AM AND THE TWR WAS NOT OPEN YET. UPON; MISTAKENLY SWITCHING MY TIMES; FROM BEFORE XB00 TO IT ACTUALLY BEING OPEN AT XA00 AM. SO; THINKING THE TWR WAS CLOSED I PROCEEDED TO MAKE A LNDG AS IT WAS UNCTLED; FOLLOWING THE LOC TO THE ARPT (NOT DOING AN APCH JUST USING AS A DIRECT GUIDE) ANNOUNCING MY INTENTIONS; AND ALT AT 12 MI; 8 MI; 6 MI; AND ONCE ON FINAL. I ALSO LANDED RWY 17R INSTEAD OF WHAT THE ATIS ADVISED; DUE TO THE FACT THAT AT AN UNCTLED FIELD; IT IS PLT'S DISCRETION AND SINCE THE WINDS WERE CALM AND I WAS ON A STRAIGHT IN LNDG FOR RWY 17; I CHOSE TO LAND RWY 17R. ONCE I TOUCHED; I NOTICED THE TFC TAXIING OFF THE RWY. I THOUGHT THEN THAT THEY HAD JUT LANDED AHEAD OF ME. BUT I WAS STILL WONDERING WHY I HADN'T HEARD THEIR INTENTIONS. I LANDED; TAXIED OFF; CLEANED UP THE PLANE AND THEN TRIED TO SWITCH THE RADIO. ONCE I SWITCHED THE FREQ TO THE TOP RADIO; I GAINED COM. SO I WAS NOT AWARE OF THE RADIO FAILURE AT THE TIME. I JUST MISTAKENLY GOT MY TIMES MIXED UP. LUCKILY IT WASN'T ANYTHING THAT HARMED SOMEONE ELSE.