Did I do my research?
Well, due to spending over ELEVEN years working towards a RN career, including getting a degree in Electronic and Communication Engineering, a brief spell in the defence industry as well and having lifelong interest in both defence and technology, makes these things very apparent to me.
Those are just a few of the reasons that make UCAVs unfeasible.
Incidently, some puritans might point out that its the C/N ratio which rain would degrade. But S/N is dependant on C/N, and its S/N that is mentioned in the Shannon Hartley Law (which says channel capacity = Bandwith X Base 2 Logarithim of [S/N ratio (in numbers, not dB) + 1).
So you don't want to go drinking with me? Fine, be like that
Talking of the SHAR ....... just kidding! But I did read a few years ago that a UAV was being consider to replace the AEW Sea King. That idea seems to have been dropped now. UAVs for reece and possibly ESM, but for actual weapon delivery? Nah, it'll never work.