I am not sure, however, if this would be allowed, as I can see arguments for and against its use. On one hand, it is a non-transmitting device, so should be allowed (obviously not at takeoff or landing). On the other, there could be security issues voiced on the subject, so it shouldn't be allowed.
Can anybody clear this up, or voice an opinion? Is there no point in even trying? Or should I just try to use it, and turn it off if told to by the cabin crew?
No you cannot use it.
The radio receivers on board the aircraft are built into the aircrafts architecture (aerials.) Your receiver isn't. There isn't an "argument" it simply isn't permitted, end of! There are electronic devices that can be used at permitted times, and guidance on these should be given on board.