Chinese FrSky radio receiver, what is this component?
This is a ceramic resonator which is used to generate a stable frequency for operation.

The problem is finding the correct frequency. The 'A' is likely the frequency code and the 'H' is probably the production date code. At least that way it is done by Murata. With a short search I wasn't able to find a comprehensive list of frequency codes to determine which frequency that is.

If it isn't a resonator from Murata, then you'd have to check other manufacturers but there aren't that many around. Most of them are just reselling stuff.