ACR LGT TAXIED INTO POSTION AND HOLD RESULTING IN MLG ON APCH EXECUTING GO AROUND.

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RWY 28L WAS BEING USED FOR TKOF AND 32 FOR LNDGS. WHILE #1 FOR TKOF; CAPT AND I HEARD FROM TWR 'XX POS AND HOLD.' (WE WERE COMPANY XX TO SFO). I ACKNOWLEDGED; 'FLT XX POS AND HOLD' AND WE PROCEEDED ONTO 28L. WE NOTICED 2 ANG FGT IN FRONT OF US ON 28L ON THE OTHER SIDE OF THE INTXN OF 28L AND 32. AT THAT POINT THE TWR CLRED THE FGT FOR DEP AND THEN ASKED US OUR POS. I TOLD TWR WE WERE IN POS ON 28L. TWR THEN TOLD THE ACFT ON FINAL FOR 32 TO GO AROUND AS THERE WERE 3 ACFT ON 28L. AFTER A SHORT DISCUSSION WITH THE TWR THAT WE ACKNOWLEDGED 'FLT XX POS AND HOLD;' THE CTLR STATED THAT HE WAS WORKING BOTH UHF (THE ANG ACFT) AND VHF. HE STATED THAT THERE WAS NO PROB AND THE CONFUSION WAS CAUSED BY WORKING DUAL FREQS. SUPPLEMENTAL INFO FROM ACN 85532. A MLG ON FINAL TO RWY 32 WAS FORCED TO GO AROUND DUE TO THE 3 ACFT ON RWY 28L AWAITING TKOF CLRNC. THE 2 RWYS ARE INTERSECTING AT THE ARR END. I FEEL THE PROB IS DUE TO THE LOCAL CTLR USING BOTH A VHF AND UHF FREQ AT THE SAME TIME. CTLR IS UNABLE TO ADEQUATELY MONITOR 2 FREQS AT THE SAME TIME DURING A BUSY TIME AND PLTS ON DIFFERENT FREQS ARE UNABLE TO MONITOR EACH OTHER.