know its a bit late but i just put a new stereo in to fix the shitty radio reception. The reason is in japan they have 2 antenna's 2 different signals or something that's why the stock units have that fm diversity on it and a 2 pronged antenna plug, when i pulled mine apart the moron that installed the signal booster hooked it up to the wrong antenna. only 1 antenna will work u just have to test them. Works perfectlly now.