A planar ultrawideband modular antenna for connection to a feed network. The antenna has a ground plane, and an array of antenna elements spaced from the ground plane, each antenna element comprising a pair of arms. A first fed arm is electrically coupled to the feed network. The grounded arm is directly electrically coupled to the ground plane. There are one or more conductors such as conductive vias electrically connecting the fed arm to the ground plane, and optionally there are one or more additional conductors electrically connecting the grounded arm to the ground plane.