RecruitingPhase 2Radiation therapyPost-prostatectomy Radiation Therapy--Moderate Versus Ultra-hypofractionated (Also Known as Stereotactic Body Radiation Therapy [SBRT])The primary purpose of this study is to compare the quality of life (QOL) reported by prostate cancer patients 2 years after treatment with ultra-hypofractionated post-prostatectomy radiation therapy (also known as stereotactic body radiation therapy \[SBRT\]) versus the self-reported QOL of those treated with moderately hypo-fractionated post-prostatectomy radiation (a current standard of care option).