I have a FoxPro Wildfire and it isn't waterproof. Decided it couldn't be all that difficult to sort out, and have converted a one gallon plastic petrol container. Cut three sides out so that the signal from the remote control can get through, with the other two sides open so that the speaker is not muffled and there you go. I didn't need to cut the fourth side so that is definitely waterproof.
The first cheap plastic box I tried just shattered, no chance of that with the thick walled petrol container.