Abstract: Antenna structures are shown that reduce fabrication and assembly time and cost, increase antenna reliability and enhance antenna performance. These structures include resilient flanges that are formed by a slotted ground plane and a rear ground plane which together surround a feed circuit. The ground planes are simply pressed together to engage the flanges in an overlapped and resiliently interlocked relationship. In other antenna structure, a capacitance probe forms a part of a coaxial transition. One end of the probe forms a capacitance face and the transition is configured to automatically space the capacitance face from a trunk end of the feed circuit. A second end of the probe is available for coupling signals to antenna-associated circuits (e.g., a downconverter). A pressed-together signal-transmission path through these circuits is formed with spring-loaded sockets. One socket receives the capacitance probe's second end and the other receives the center pin of an external coaxial connector.