The use of high power jammers on vehicles for Improvised Explosive Device (IED) detonation prevention and strategic enemy communications jamming, allows for high levels of noise and interference to couple from the jamming systems to the co-located on-board communications radio receivers. The high levels of jammer noise desensitise communication receivers and render them less effective. The use of phase and amplitude variation through the use of analog vector modulation circuitry as well as power level error detection are evaluated for a noise and interference cancellation system. In this paper, the design and implementation of a prototype are discussed and performance of the prototype is measured in order to assess the design strategy and the usefulness of vector modulation circuits in cancellation systems.