AN SF340 FLC PERFORMS AN UNAUTH TKOF WHEN DEALING WITH FAULTY RADIO RECEPTIONS AT CYQB; PQ.

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WE WERE GIVEN 'POS AND WAIT' BY TWR ON RWY 6. THEIR RADIO WAS VERY BAD -- FULL OF STATIC AND BROKEN UP. THEY ISSUED WHAT I WAS CERTAIN OF A TKOF CLRNC; BUT I COULD NOT UNDERSTAND THE ALT AND VECTOR. MY FO AND I BOTH ASKED THEM TO REPEAT IT SEVERAL TIMES AND ADVISED THEM THAT THEIR RADIO WAS NEARLY UNREADABLE. FINALLY; ANOTHER VOICE ON ANOTHER RADIO STOPPED IN AND CLARIFIED THE ALT AND VECTOR. ABOUT 1/2 WAY DOWN THE RWY I HEARD ANOTHER XMISSION; BUT IT WAS COMPLETELY GARBLED. I STATED 'UNREADABLE' IN RESPONSE. IMMEDIATELY AFTER TKOF; I SWITCHED OVER TO DEP. SHE ADVISED ME THAT WE DID NOT HAVE A TKOF CLRNC (THE ONE THING I WAS SURE I HAD HEARD). OBVIOUSLY; THE BIG ELEMENT HERE WAS THE ABYSMALLY BAD TWR RADIO. SECONDARILY; I SHOULD HAVE INSISTED ON A CLR XMISSION OF THE ENTIRE CLRNC; BUT -- AND THIS IS ALWAYS A PRACTICE THAT INCREASES PRESSURE TO GO ON A FLC -- WE HAD BEEN POSITIONED ON THE ACTIVE RWY FOR A CONSIDERABLE PERIOD OF TIME BY THEN. I KNOW FROM PERSONAL EXPERIENCE THAT BEING ON TWR CTL IS NO GUARANTEE THAT NO ONE WILL TRY TO LAND ON TOP OF YOU. SUPPLEMENTAL INFO FROM ACN 518097: WHEN RECEIVING OUR TAXI CLRNC FROM THE GND CTLR; I INFORMED HIM THAT HIS XMISSION WAS VERY BROKEN AND HARD TO UNDERSTAND. AFTER HE REPEATED THE CLRNC; I COULD UNDERSTAND IT ENOUGH TO REPEAT IT BACK TO HIM WITH HIS SATISFACTION. WE TAXIED TO THE HOLD LINE FOR RWY. WE WERE GIVEN POS AND WAIT ON RWY 6. WHILE IN POS; THE CTLR AMENDED OUR CLRNC WITH A NEW HDG OF 120 DEGS AND 3000 FT. I ASKED FOR VERIFICATION TWICE AND THE CAPT THEN ASKED FOR VERIFICATION AND WAS SATISFIED WITH HIS ANSWER. WE STARTED THE TKOF ROLL. WE SHOULD HAVE STAYED IN POS AND HAD THEM TRY ANOTHER XMITTER UNTIL WE COULD CLRLY UNDERSTAND THE TWR CTLR. THE SIT DID NOT SEEM TO CAUSE ANY DANGEROUS SIT OR A CONFLICT WITH ANY OTHER ACFT. BUT IT COULD HAVE.