Antennas, multi-antenna apparatus, and antenna housings

An antenna apparatus, comprising:

• a shielding element;
• a ground plane element;
• an array of conductive mast elements configured to receive radio signals and driven by an electrical current to transmit radio signals, wherein the array of conductive mast elements are positioned between the shielding element and ground plane element;
• and
• a conductive and hollow tubular passage positioned between and providing a passageway through the shielding element and ground plane element such that wiring may pass through the hollow tubular passage;
• wherein the array of conductive mast elements and the hollow tubular passage are positioned relative to one another between the shielding element and ground plane element such that when the electrical current is supplied to drive the mast array of conductive mast elements for transmitting radio signals, and a radiation of radio signals from the driven array of conductive mast elements in combination with radiating off the non-driven hollow tubular passage has a substantially omnidirectional azimuthal radiation pattern.