This invention provides an improved antenna structure comprising a connecting unit having a connector, a lightning rod, and a signal transmission section. The two ends of the connector has the first and second connecting sections, with the signal transmission section extending out the first and second connecting sections; and a connecting unit connecting to the antenna unit, which contains at least an antenna board fixed to the first connecting section and the signal transmission section, and a set of housing installed at the outer section of the antenna board and connecting to the connector. Through this, the lightning rod, connecting unit, and antenna unit can be integrated together and the effectiveness of simple structure, ease to assemble, and lowered manufacturing cost can be achieved.