An experimental system is developed to measure the high frequency (1 MHz to 7 MHz) viscoelastic constants of liquids and deformable solids using a layered waveguide geometry consisting of an aluminum strip delay line upon which coatings are applied. A piezoelectric transducer mounted at one end is used to generate and receive pulses of radio frequency shear waves that reflect back and forth in the line. The change in attenuation and the phase shift of the wave in the line produced when the sample coating is applied are measured by a calibrated attenuator method and an echo superposition technique, respecively. From these measurements the viscoelastic constants of the sample are calculated using the layered waveguide equations developed earlier. The conditions under which these equations can be applied to the delay line are discussed in detail. Tests were made with a series of four poly(dimethylsiloxane) samples having static viscosities ranging from 100 to 100,000 centistokes. The measure changes are calculated for a wave traveling 1 cm in the delay line and are reproducible to within ±0.009 decibels/cm of attenuation and ±0.06 degrees/cm of phase shift in a total change of 0.5 dB/cm and 1.4 degrees/cm. The measured viscoelastic properties agree with those reported in the literature. The delay line has a high sensitivity to liquids. Measurements on a 3.64 centipoise toluene solution of polystyrene agree with values obtained by extrapolating lower frequency measurements reported in the literature.