This paper presents a V-band frequency sixtupler in 130-nm SiGe BiCMOS, achieving a high conversion gain (CG) and harmonic suppression (HS). The design cascades a class-A differential frequency tripler with a bandpass filter followed by a driver amplifier for third harmonic extraction and a bootstrapped Gilbert-cell based frequency doubler to generate the sixth harmonic. An active balun ensures balanced operation, while an asymmetric coupled line balun suppresses undesired harmonics at the single-ended output. Measured results demonstrate a peak output power of 5.8 dBm at 61.2 GHz with 37 dB CG and 4.2% total efficiency, consuming 90 mW dc power. A 3-dB bandwidth (BW) from 55.2 GHz to 67 GHz is achieved with at least 35 dB HS across the whole band. To the best knowledge of the authors, this work achieves the highest reported CG for V-band frequency multipliers.