[jocko]

i have not - why are you suspecting the radio specifically?

Though not common, one thing worth checking is to make sure your underhood utility light actually shuts off when closing the hood - it won't gravity rock and click off until hood is almost shut, so you kinda gotta watch closely. Not likely the culprit, but worth checking.

Best way to chase a batt drain is with a voltage drop check as you (or hopefully an assistant) pulls individual fuses one at a time.