FLC OF A LEAR; LR35; LANDED WITHOUT CLRNC DUE TO THE FO DIALING IN THE WRONG FREQ.

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FLT FROM TPA TO PTK TO PICK UP PATIENT AT PTK. LEAR 35 IN AIR AMBULANCE. WX WAS RPTED POOR AT PTK. WE HAD BEEN GETTING COMPLAINTS FROM #1 COM RADIO. NUMEROUS ATC FACILITIES RPTED WEAK AND BARELY READABLE XMISSIONS ALTHOUGH WE WERE RECEIVING FINE. WE BEGAN USING #2 COM WHICH ONLY HAD 1 FREQ UNLIKE #1 WHICH HAD ACTIVE AND STANDBY FREQS. WE RECEIVED NO COMPLAINTS FROM #2 COM. WE WERE VECTORED TO AND INTERCEPTED ILS TO PTK AND TOLD TO CONTACT TWR. I DIALED WHAT I THOUGHT WAS PTK TWR FREQ IN #2 COM AND MADE CALL ON ILS THEN GOT BUSY RUNNING CHKLIST AND MONITORING APCH (CAPT WAS FLYING). UPON BREAKING OUT APPROX 300 FT; CAPT ASKED IF WE WERE CLRED TO LAND. I ATTEMPTED CALLING TWR AGAIN AND RECEIVED NO RESPONSE. I TRIED A COUPLE TIMES WITH NO LUCK. NOTING THAT RWY WAS CLR WE ELECTED TO LAND RATHER THAN GAR. AFTER CLRING RWY WE CALLED GND AND COMMUNICATED WITHOUT A PROB ALTHOUGH THEY WERE NOT THRILLED WITH OUR COMS PROCS. IN RETROSPECT I BELIEVE I DIALED IN WRONG FREQ. PTK TWR IS 120.50; I THINK I DIALED 120.05 AND NEVER CAUGHT IT. I HAD 120.50 SET IN #1 COM BUT WE WERE USING #2 COM AND I MADE MISTAKE WHEN SWITCHING. USING SLIGHTLY DIFFERENT PROC ON #2 COM HELPED CAUSE PROB. I GOT BUSY AND NEVER CAUGHT IT. TIMING WHEN SWITCHING FROM APCH TO TWR IS TYPICALLY BAD. WE GOT SWITCHED WHILE INTERCEPTING GS AND IS TIME WHEN I AM LOWERING GEAR AND FINAL FLAP AND RUNNING FINAL CHKLIST (IN WHICH TWR COM IS NOT INCLUDED). THIS MAKES IT EASY TO MISS IMPORTANT DETAILS. I WILL INCLUDE CLRED TO LAND CHK ON FINAL CHKLIST AS WELL AS MENTAL CHKLIST -- GEAR DOWN; FULL FLAP DOWN; CLRED TO LAND.