The first end-to-end Goubau-line-based wireless power transfer system with high efficiency is demonstrated in this paper. The wide spatial distribution of its electromagnetic fields and the lack of significant radiation are two of the most desirable characteristics of the Goubau line for mid-distance wireless powering applications. In this work, we demonstrate a measured RF efficiency of 35% to a single receiver at a distance of 0.5 m for a 233 MHz signal. Further, the performance of multi-receiver power transmission is also examined, as well as the addition of a rectification block, rounding out the wireless power transfer system. Practical advantages of this system over existing state-of-the-art systems are also discussed.