A miniature combo built-in antenna structure built in a personal navigation device (PND) includes a substrate, a first antenna unit and a second antenna unit. The first antenna unit is a signal receiving antenna of a global positioning system (GPS), and the second antenna unit is a signal receiving antenna of a traffic message channel (TMC) receiving module. The first and second antenna units are integrated into a substrate and built in the GPS, for receiving GPS signals as well as related information of road conditions and weather.