Magnetization dynamics in a synthetic antiferromagnet with magnetic layers of FeCoB were investigated through microwave absorption spectroscopy. Resonant absorption signal detected along different directions in the plane of the films was analyzed through a graphical representation reminiscent of the critical switching curves. The advantage of this representation is that anisotropy and coupling effects can be determined by inspection. Further, this data can then be readily compared to the static switching curve which we obtained through reversible susceptibility measurements. The correlation between static and dynamic critical curves is supported by macrospin simulations.