Those whip antennas are for FM broadcast. For the AM broadcast, the bar antenna has a coil of wire wrapped around an iron bar to compensate for requirement of a

Those whip antennas are for FM broadcast. For the AM broadcast, the bar antenna has a coil of wire wrapped around an iron bar to compensate for requirement of a longer antenna to receive AM broadcast. It'd be actually size prohibitive to make an antenna like FM radio, but designed for AM.