An example antenna system includes a connection member, a first pair of antipodal Vivaldi antennas, and a second pair of antipodal Vivaldi antennas. The first pair of antipodal Vivaldi antennas are coupled to the connection member, positioned co-planar with each other along a first plane, and inverted relative to each other. The first pair of antennas provide approximately 180 degrees of phase shift (frequency independent) for a first group of signals. The second pair of antipodal Vivaldi antennas are coupled to the connection member, positioned co-planar with each other along a second plane substantially orthogonal to the first plane, and inverted relative to each other. The second pair of antennas provide approximately 180 degrees of phase shift (frequency independent) for a second group of signals. The antenna system is configured to utilize the first and second pairs of antennas to transmit or receive signals with circular polarization.
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