Inclusion Criteria:  Patient aged ≥55 years of age Cardiomyopathy (Left ventricular ejection fraction ≤ 35% and ICD in situ) AND Recurrent VT events despite previous CA OR VT events requiring intervention and PAINESD score ≥ 15  Exclusion Criteria:  Patients with NYHA Class IV heart failure &/ or with LVAD in situ Patients not expected to live for more than one year for any reason Patients who have previously received thoracic radiotherapy Patients who are enrolled in another randomized clinical trial Patients who are unable or unwilling to provide informed consent Patients aged ≤54 years of age Pregnancy (all women of child bearing age and potential will have a negative β-HCG test before enrollment) Breastfeeding Women of childbearing age who refuse to use a highly effective and medically acceptable form of contraception (IUD, sterilization, birth control implant or birth control pill) throughout the study.