The present invention relates to an antenna apparatus, which has an antenna cover and a base, the antenna cover being fixed onto the base to form a sealed waterproof space, wherein a first antenna assembly is disposed in the sealed waterproof space, the first antenna assembly comprising: an antenna element support; an antenna element fixedly wound around the antenna element support, the antenna element being composed of a spiral-like winding and an inductance coil; and an amplifier substrate fixed onto the base and connected to the antenna element. The antenna apparatus is applicable to frequency bands such as AM/FM, DAB/DMB, and TV, and has advantages of having a small size, low costs, high space utilization, etc.