A direct measurement of the amplitude function across each of the Tevatron collider Interaction Regions is presented. The data were obtained during three Tevatron study periods, each dedicated to other measurements. However, the beam position data generated were found to be appropriate for the present analysis as well. This first look presumes uncoupled transverse motion, an assumption which will be lifted in future analyses. The results suggest that the values of beta-star, the amplitude function at the Interaction Point, are near their design values of 35 cm at both detectors, in both planes and can be measured readily with the new Tevatron BPM system to an accuracy of a few percent or better.