FLC OF AN LTT TUNED TO THE WRONG ADF FREQ RESULTING IN INTERVENTION BY ATC TO DIRECT THEM TO THE ASSIGNED RADIO BEACON FOR APCH.

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WE WERE INBOUND TO NASHVILLE ON THE GRAHAM 3 ARR. APPROX 20 MI SW OF BNA; APCH CTL GAVE US A HDG OF 080 DEGS. WE WERE THEN CLRED DIRECT TO DOBBS (BN 304); THE OM FOR RWY 2L AT BNA. AS PNF; I WAS BUSY COMPLETING REQUIRED DUTIES WHILE THE FO WAS FLYING THE ACFT. I SAW THE FO MOVE HIS HAND TO THE FREQ SELECTOR FOR THE ADF; BUT DIDN'T THINK MUCH ABOUT IT AT THE TIME. ABOUT A MIN LATER AFTER COMPLETING MY REQUIRED DUTIES; I CHKED THE FREQ IN THE ADF AS A DOUBLE CHK; BECAUSE I REMEMBERED HAVING SET UP 304 FOR DOBBS EARLIER IN THE DSCNT. I THEN DISCOVERED THE FO HAD SELECTED OPERY (VI 344) ON THE ADF; AND THAT WE WERE PROCEEDING DIRECT TO OPERY; WHICH IS N OF THE ARPT ON THE OPPOSITE DIRECTION APCH TO RWY 20R AT BNA. AS WE WERE MAKING A TURN FROM OUR 030 DEG HDG TO A 090 DEG HDG TO CORRECT; APCH ASSIGNED US A 090 DEG HDG. APCH SAID NOTHING ELSE. THE FO ADMITTED SELECTING THE WRONG FREQ FROM THE WRONG CHART. HERE ARE 2 ILS'S; OPPOSITE DIRECTION; WITH THE #2 IN THE RWY DESIGNATOR. ALSO THE ADF FREQS ARE SIMILAR -- 304 AND 344. I BELIEVE THIS DEV OCCURRED FOR THE FOLLOWING REASON. THE FO HAS BEEN IN THE R SEAT A LONG TIME; WITH LOW PAY AS WITH MOST REGIONAL AIRLINES; AND HAD ADMITTED TO BEING BORED; BURNED OUT; AND READY TO DO SOMETHING ELSE. (GET OUT OF AVIATION) I BELIEVE THIS HAS LED TO COMPLACENCY ON HIS PART. THIS COMPLACENCY ON HIS PART; COMBINED WITH MY INATTN TO WHERE WE WERE GOING BECAUSE OF MY NON-FLYING DUTIES; GOT US HEADED IN THE WRONG DIRECTION. I HAVE BECOME A BIT COMPLACENT ALSO; IN THAT I COULD HAVE PERFORMED THOSE NON-FLYING DUTIES EARLIER IN THE APCH; ALLOWING ME TO BE MORE 'PLUGGED IN' AS WE GOT CLOSE TO THE ARPT. THIS WAS A FAMILIAR APCH; (SO WE THOUGHT) IN DSCNT WX; WITH LOW TFC. I'LL PAY MORE ATTN FROM NOW; AS COMPLACENCY SNUCK UP ON ME WHILE KNOWING HOW MY FO FELT.