Antenna systems with beam tracking and scanning ability are described. The antenna systems include one or more reflectors and one or more feeds. The tracked or scanned beam(s) are produced by moving the feed(s) while the reflector(s) is kept static. This greatly reduces the complexity of the antenna beam tracking and scanning mechanism, while providing the highest possible antenna efficiency and gain in a wide angular range. Multiple beams and/or switched beams can also be achieved using multiple feeds and/or switches.

Provided herein are various enhancements for radio frequency antennas and antenna arrangements. In one example, an apparatus comprises a reflector for radio frequency energy having a reflector surface comprising a paraboloid of revolution that establishes an inverted truncated conical shape with a concave nappe. The reflector surface is configured to interact with the radio frequency energy to direct at least a portion of the radio frequency energy towards a feed array mounted about a perimeter of the inverted truncated conical shape.

Omni-directional, horizontally polarized antennas are provided. According to one aspect, an omni-directional, horizontally polarized antenna includes a first reflector and a second reflector separated from the first reflector. Disposed between the first and second reflectors are a planar array of radially directed horizontally polarized antenna elements and a planar feed network configured to feed the antenna elements of the planar array. A coaxial feed structure configured to communicate electrical signals to or from the feed network is provided.