A dual-interface card comprising: a card body containing an antenna, the antenna having first and second antenna connections; and a dual-interface integrated circuit card module comprising: a substrate having first and second opposing surfaces; a contact area on the first surface of the substrate, the contact area comprising a plurality of contact pads and first and second routing connections each having a first end and a second end; an integrated circuit on the second surface of the substrate; electrical connections through the substrate connecting the integrated circuit to the plurality of contact pads and to the first end of each of the first and second routing connections; and first and second antenna connectors disposed in respective first and second holes in the substrate and in electrical contact with the second end of the respective first and second routing connections, the antenna connectors comprising solder; characterized in that it further comprises a metal plug placed across one or both of the first and second holes on the second surface of the substrate, wherein the first and second antenna connectors of the card module are electrically connected to the first and second antenna connections of the card body. a card body containing an antenna, the antenna having first and second antenna connections; and a dual-interface integrated circuit card module comprising: a substrate having first and second opposing surfaces; a contact area on the first surface of the substrate, the contact area comprising a plurality of contact pads and first and second routing connections each having a first end and a second end; an integrated circuit on the second surface of the substrate; electrical connections through the substrate connecting the integrated circuit to the plurality of contact pads and to the first end of each of the first and second routing connections; and first and second antenna connectors disposed in respective first and second holes in the substrate and in electrical contact with the second end of the respective first and second routing connections, the antenna connectors comprising solder; characterized in that it further comprises a metal plug placed across one or both of the first and second holes on the second surface of the substrate, wherein the first and second antenna connectors of the card module are electrically connected to the first and second antenna connections of the card body. a substrate having first and second opposing surfaces; a contact area on the first surface of the substrate, the contact area comprising a plurality of contact pads and first and second routing connections each having a first end and a second end; an integrated circuit on the second surface of the substrate; electrical connections through the substrate connecting the integrated circuit to the plurality of contact pads and to the first end of each of the first and second routing connections; and first and second antenna connectors disposed in respective first and second holes in the substrate and in electrical contact with the second end of the respective first and second routing connections, the antenna connectors comprising solder; characterized in that it further comprises a metal plug placed across one or both of the first and second holes on the second surface of the substrate, wherein the first and second antenna connectors of the card module are electrically connected to the first and second antenna connections of the card body.