ACR SMT DEVIATED FROM CLRNC ROUTE.

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F/O'S LEG. CAPT ASSUMED CTL WHILE F/O LOOKED FOR A LOST PAIR OF SUNGLASSES. WE WERE ON AN ASSIGNED HDG OF 070 DEGS TO JOIN V5 OFF OF CVG (036 DEGS INBND). CAPT'S VOR NEEDLE STARTED TO COME IN SO A TURN TO THE LEFT WAS BEGUN. AFTER ABOUT 25 DEGS OF TURN; THE 'OFF' FLAG APPEARED AND THE NEEDLE PEGGED TO THE RIGHT. IT APPEARED TO BE A STRAY SIGNAL OR SCALLOP OFF OF CVG. AN IMMEDIATE TURN BACK TO 070 DEGS WAS BEGUN. CENTER CALLED AND SAID TO TURN RIGHT TO 090 DEGS. ANOTHER VOICE CAME ON AND SAID RIGHT TO 120 DEGS. HE ASKED IF WE HAD TURNED OFF OF OUR HDG. I SAID THAT WE APPEARED TO BE INTERCEPTING V5; BUT THEN REALIZED THAT IT WAS A STRAY SIGNAL AND TURNED BACK TO OUR HDG. HE ASKED US TO CALL ON THE GND. I TALKED TO THE SENIOR CTLR AND HE SAID A STUDENT WAS WORKING OUR FLT WITH AN INSTR SUPERVISING. WE HAD TURNED IN THE DIR OF ANOTHER ACFT CAUSING A POSSIBLE CONFLICT. (I HAD A VISUAL ON THE OTHER ACFT.) WE HAD COME WITHIN ABOUT 6 MI; ACCORDING TO HIM. CVG VOR IS THE WORST VOR I KNOW OF FOR SCALLOPING SIGNALS. BOTH COMING IN FROM THE N AND S; YOU CAN EXPECT WIDE DEVIATIONS OF SIGNALS FROM THE STATION.