A high speed connector with reduced crosstalk utilizes individual connector support frames that are assembled together to form a block of connector units. Each such unit supports a column of conductive terminals in two spaced-apart columns. The columns have differential signal terminal pairs separated from each other by larger intervening ground shields that serve as ground terminals. The ground shields are arranged in alternating fashion within the pair of columns and they are closely spaced together so as to face a differential signal terminal pair. The support frames support the ground and signal terminals utilizing radial spokes in which the spokes take the form of ribs that extend along the inner surfaces of one of the connector halves and define V-shaped air channels.