Microstrip transmission of electrical signals between two arrays of signal conductors such as two printed circuit boards is maintained in an electrical connector in which signal contacts are disposed on opposite sides of the central ground bus. Signal contacts are urged inwardly into engagement with a central dielectric wall and a ground bus is similarly urged outwardly into engagement with the same wall to establish the microstrip configuration between each row of terminals in the central ground bus. The receptacle connector includes a right angle bend and signal contacts as well as the ground bus also have a right angle bend. The insulative housing of a right angle connector comprises upper and lower housing members which are snapped into engagement. Resilient arms, forming a part of the connector mounting assembly on the upper housing member, engage the lower housing member to hold it in place.