The purpose of this paper is to offer a comprehensive survey on the major technical issues and current research trends in  supporting VR services over wireless networks. Additionally, the paper explores the fundamentals of VR technologies,  applications, QoE requirements, spectrum requirements and key enabling technologies. Finally, a comprehensive discussion regarding potential research directions aimed at enhancing wireless VR experiences is also presented. Thus, this survey paper is structured to provide a strong baseline for the researchers working in wireless VR systems.